Saving houses and people from burning generates many well deserved karmapoints. May you live long and prosper, Andreas.

@AndreasSpiess

6 жыл бұрын

Thanks! You never know, maybe I once will need your wishes ;-) I was just at a funeral of a friend on Friday.

@damiendalton8397

2 жыл бұрын

I dont mean to be so off topic but does anybody know a trick to log back into an Instagram account? I stupidly forgot the password. I appreciate any tricks you can give me.

@bishopquentin3577

2 жыл бұрын

@Damien Dalton Instablaster ;)

@damiendalton8397

2 жыл бұрын

@Bishop Quentin i really appreciate your reply. I found the site thru google and I'm in the hacking process atm. Looks like it's gonna take a while so I will get back to you later when my account password hopefully is recovered.

@damiendalton8397

2 жыл бұрын

@Bishop Quentin It worked and I finally got access to my account again. I am so happy! Thanks so much you saved my ass !

I just wanted to tell you how much I really appreciate your Channel. Your very brilliant and thorough.

@AndreasSpiess

6 жыл бұрын

Thanks!

You have one of the most complete, detailed and well explained videos online!! Thanks for all your hardwork!!

@AndreasSpiess

4 жыл бұрын

You are welcome!

A fantastic video on the subject. The Internet needs more like these on their respective subjects. Thank you Andreas and also for the links to buy the components.

@AndreasSpiess

6 жыл бұрын

You are welcome. It is a pleasure if it helps

Excellent video. I never fail to learn important information when I watch your videos. Thank you!

@AndreasSpiess

6 жыл бұрын

You are welcome. Glad to read that.

This video is not just useful. This video is life saving. I have hundreds of unprotected cell. I'm going to add protection to all of them.

Dear Andreas, I am each time pleasantly surprised by your video's quality and contents ! I always learn something ! Thanks for your time and for the links. 👍👍👍👍👍

@AndreasSpiess

6 жыл бұрын

I am glad to read this. Thanks!

Hello Andreas Thank you for this very safety video. Best regards from France.

@AndreasSpiess

6 жыл бұрын

De rien!

That was mad skillz (as the kids say). Thank you again Andreas. I hope one day I'll get to meet you and thank you in person!

I am late to the game with Li-Ion batteries. I am going through your videos and the amount of learning is incredible. Just like sitting in the front low of a a lecture/ Lab. Thanks for creating these very informative videos.

@AndreasSpiess

2 жыл бұрын

Glad my videos are useful!

Amazing, simple and cheap. Very useful. Thank you very much!

@AndreasSpiess

6 жыл бұрын

You are welcome!

This is amazing! Never knew such a thing exists.

@AndreasSpiess

6 жыл бұрын

:-)

Thank you very much Andreas, I had no idea about the dangers of stored 18650 batteries or when they are complete discharged, it makes a lot of sense. I didn't know about the battery protectors either, so I ordered several protectors to my 18650 batteries I have around and I after I install them I won't lose any sleep over it.

@AndreasSpiess

6 жыл бұрын

:-)

Brilliant channel. Love all the videos. Presentation is excellent. 👍

@AndreasSpiess

6 жыл бұрын

Thank you!

Another fantastic episode. Thank Andreas for the information. This one as we as in Australia is going straight to the pool room.

@AndreasSpiess

6 жыл бұрын

Of course, I had to look the sentence up. But now, I learned a little "Australian"

Very useful, as I was not aware the kits existed. Cheers.

@AndreasSpiess

6 жыл бұрын

:-)

Very nice. Thank you. I am glad you did not quit KZread over economic issues.

@AndreasSpiess

5 жыл бұрын

I am still here...

Simple and to the point great job, thanks

@AndreasSpiess

6 жыл бұрын

You are welcome!

Thank you Andreas for a very informative video.

@AndreasSpiess

6 жыл бұрын

You are welcome!

Good job dude, clear and informative!

@AndreasSpiess

6 жыл бұрын

:-)

I was playing around with same type of Li-Ion batteries, and did not know it will get degerous if discharged below 2.5V. Good work Andreas.

@AndreasSpiess

6 жыл бұрын

I also did not know and it seems not to happen all the time. Maybe I just had bad luck...

Very useful for me. Learnt a lot. Thanks.

@AndreasSpiess

6 жыл бұрын

:-)

Good video. Useful. I have a few cells sitting around that I have not paid much attention to. I think I will check the before charging and pay a little attention to the process just to be sure I don't end up with a disaster.

@AndreasSpiess

6 жыл бұрын

This is exactly what I do. I do not charge them unattended anymore.

Awesome. I‘m getting a bunch of these right away.

@AndreasSpiess

6 жыл бұрын

:-)

とてもわかりやすい解説動画でした。 ありがとうございました。

@AndreasSpiess

3 жыл бұрын

どういたしまして！

Ahh what a super video! Thanks for this, it's exactly the type of solution I have been hunting for.

@AndreasSpiess

Жыл бұрын

You are welcome!

Hi Andreas, Thank you very much for all the work you put into these videos, they continue to be so helpful. Perhaps you have already noticed, but you have the LI cell and load/charger exchanged! As you point out, these cells can be dangerous, so I wanted to bring this to your attention. Keep up the good work.

@AndreasSpiess

3 жыл бұрын

You are right. If I remember right my error already was discovered by another viewer.

@epleace

3 жыл бұрын

@@AndreasSpiess Thanks for replying - and I'm relieved that someone already spotted this. And I want to repeat my thanks, I find your videos so very useful and (yes) interesting.

A perfect reference to the topic - as ever.

@AndreasSpiess

6 жыл бұрын

Thanks!

@richard_wenner

6 жыл бұрын

Where you get the time from to do all of this!

@AndreasSpiess

6 жыл бұрын

From the usual 24h (plus the night, if it is not sufficient ;-)

Interesting video ! Very nice tutorial. Greetings from Belgium !

@AndreasSpiess

6 жыл бұрын

Thanks! Maybe it helps somewhere...

As allways... simply a genius

@AndreasSpiess

6 жыл бұрын

Thanks!

Excellent video 👏👏👏👏👏

@AndreasSpiess

6 жыл бұрын

Thanks!

Amazing Andreas!

@AndreasSpiess

6 жыл бұрын

:-)

Very Interesting. I guess I never thought I could ruin my cells by ignoring them. Thanks.

@AndreasSpiess

6 жыл бұрын

You are welcome!

Excellent, thanks for sharing this!

@AndreasSpiess

6 жыл бұрын

:-)

Thank you for your very informative and interesting video.

@AndreasSpiess

3 ай бұрын

Glad it was helpful!

Very informative, I learned a lot from it.

@AndreasSpiess

6 жыл бұрын

:-)

The video is useful as usual. Thanks

@AndreasSpiess

6 жыл бұрын

You are welcome!

Another BRAVO presentation, Mr. Guy With a Swiss Accent! Are you a professor or something? I kind of like it that you always write down on your video the objectives of your video...and then proceed on to explain following those objectives. Over 100% per cent for another good video. Thanks

@AndreasSpiess

6 жыл бұрын

No, I am no professor. Just a part-time lecturer ;-) Thanks for your nice words!

Again very interesting! .. Thanks Andreas ..

@AndreasSpiess

6 жыл бұрын

You are welcome!

I use them protected TP4056's a lot, but I've been looking for this very device. Great Video... You can still use the unprotected cell holder... All you have to do is cut them in half and you can either screw them in place or you can use a piece of tough plastic and epoxy to the correct length

@AndreasSpiess

6 жыл бұрын

Thanks for the tip. I will try that.

you have good skills

@AndreasSpiess

3 жыл бұрын

Thank you!

Thanks ! Awesome channel!

@AndreasSpiess

6 жыл бұрын

:-)

Very useful, thank you.

@AndreasSpiess

6 жыл бұрын

:-)

Andreas, I very much enjoyed not only this video but others of yours as well. Yours is the first video to mention a protection method of cell protection on the web that I have seen to date. You already helped me to solve a problem that I was unaware of. I am trying to build a simple 4cell 18650 LI-on power bank and stupidly I rushed ahead and purchased unprotected cells. Thankfully your protected cell modification will help me there. I'm trying to build a small pack that will give me the following outputs at the flick of a switch: 12v, 5v, and 3v. If you could point me in the proper direction I would be happy to make a contribution to your site. Thank you in advance for your help.

@AndreasSpiess

3 жыл бұрын

First: If this is your real name, you are very lucky ;-) Second: I do not know where I could help: You know what you want and with the help of Google you will find a project which covers your wishes.

a lot of work. I have tried to make it protected but in manual there were information about not soldering it but just sticking it loose and it was a catastrophe.

Very helpful! Thanks.

@AndreasSpiess

6 жыл бұрын

You are welcome!

Thank you for very informative video. God bless to you.

@AndreasSpiess

6 жыл бұрын

:-)

Bravo, bvooo , bvooo, thank you my friend. That was as knowledgeable as it was informative. Well done I'll be subscribing .

@AndreasSpiess

2 жыл бұрын

Welcome aboard the channel!

Great video!👍

@AndreasSpiess

5 жыл бұрын

:-)

Thanks for sharing !

@AndreasSpiess

4 жыл бұрын

:-)

Not a video I expected to be, but still useful.

@AndreasSpiess

5 жыл бұрын

Thank you!

What a godlike video!! Everything explained detailed enough with examples, thank you very much! If I were to build a custom battery for e-bike with 100+ cells, should i protect each one of them?

@AndreasSpiess

6 жыл бұрын

AFAIK battery management boards used in these batteries already have these protections built-in (in addition to load balancers)

very informative thanks

@AndreasSpiess

6 жыл бұрын

You are welcome!

Great video. I'm just getting into 18650s and this protection circuit is just what I was looking for. Many thanks as always for your excellent channel!

@AndreasSpiess

6 жыл бұрын

You are welcome!

06:51 It seems like, data sheet of DW01x says to connect batttery to on the left side (near VCC and GND) and take output from BATT+ and BATT- terminals.

@AndreasSpiess

3 жыл бұрын

You are right.

Thank you for posting the informative safety video. Corporations have not made it clear why lithium cells should not be used after dropping below a certain voltage. As I understand things the problem is that the working materials are carried on the surfece of a copper foil. The copper is not supposed to be involved in the chemical reaction. When the cell is discharged below a certain voltage the working material becomes depleted and the copper starts dissolving in the electrolyte. Upon recharging the copper plates back onto the foil but does not do so evenly. It forms dendrites which grow across the cell and can eventually causes a short. This can cause the cell to vent or explode. After a cell has been undervolted there is no way I know of to test if it has become a bomb. Strangely, many made in China chargers will automatically charge an undervoltage cell without giving any warning. Adding protection to a cell is a good idea but only if the cell has never been undervolted. The protection board cannot prevent a copper dendrite that already exists from shorting the cell. Good luck with your videos.

@AndreasSpiess

Жыл бұрын

Thank you for the additional information!

Thanks you very much Andreass

@AndreasSpiess

6 жыл бұрын

:-)

Fully discharging does not "change the chemical structure in a non reversible way"... What happens to them with a deep discharge that can cause danger during a subsequent charge cycle is that during the lowest voltage parts of the discharge, a /Physical/ change can occur. Metal deposits can form on the films inside the battery that bridge between the insulation gaps, allowing it to short out internally once the voltage reaches a value that can arc the remaining gap. This is not a guaranteed behavior, but can happen, especially with cheaper construction cells. A few youtubers have looked at this deeper (Big Clive I believe has done a video or two on it?) I believe that I recall it being that certain metals that are used in some batteries are susceptible to this at the lower voltages, while others are not.

@AndreasSpiess

6 жыл бұрын

Thank you for your explanation. I did not know the details. My cell was not a cheap one, it was branded (Sanyo if I remember right)

@SidneyCritic

6 жыл бұрын

BigClive vid. kzread.info/dash/bejne/pYar0buDqc3AftI.html

@pfeerick

6 жыл бұрын

Yeah, it's *that* BigClive video ;) And the critical thing there (or at least according to the research report that Clive referenced) was it could only happen to batteries that were in series, as the fatal damage occurred when the batteries were taken 12% below 0v. For something to happen to a single cell, I wonder if it was *shocked* by being unusually flat and then seeing the full charge current, or if there was some other fault in the cell which was triggered by the discharge/charge.

@ksmith7122

6 жыл бұрын

the link to the information Big Clive used www.nature.com/articles/srep30248

@leocurious9919

6 жыл бұрын

Well that "/Physical/ change" happens because of a (electro-)chemical reaction. Or where do you think the metal comes from, in a pruely physical way?

Another informative video thank you. Just one small point, I think I am right in saying that 18650´s are Lithium ion not Lithium Polymer . Someone searching for information on Lithium Ion (18650) information may not find this video.

@AndreasSpiess

6 жыл бұрын

Yes you are right and I corrected it in the comment

Excellent video once again! I am always impressed. It is OK if you make the odd video that doesn't reach this high mark. Thanks.

@AndreasSpiess

6 жыл бұрын

Thanks! I do not really understand your second sentence.

@ReevansElectro

6 жыл бұрын

I don't think that anyone should expect every video to be equally good and I don't want to see you feel pressured to always turn our the greatest videos. I admire your capacity and drive.

@AndreasSpiess

6 жыл бұрын

Now I understand. Thanks! My father told me "If you do something, do it right!". And this was not a bad advice since then ;-)

Thanks!

@AndreasSpiess

6 жыл бұрын

:-)

Hello Andreas, Nice and informative video, however I believe (correct me if I am wrong) that there is a mistake at 06:42 : the battery should not be connected between BATT+ and BATT- on the right side of the schematic, but rather between the two black dots on the left side of the schematic. The analysis of the DW01 function diagram shows the two overvoltage and overdischarge comparators on the left side also, which confirms my statement. The purpose of BATT+ and BATT- is to indicate the outer battery pack contacts, like for a cordless drill for example.

@AndreasSpiess

3 жыл бұрын

You are right. My mistake.

@Ghost572

7 ай бұрын

I was going to say the same thing, thanks for clarifying what I already thought. I must admit though those diagrams are pretty stupid having the word BAT + and BAT- when its actually infact the power coming in from that side to charge the battery.

good video thank u

@AndreasSpiess

4 жыл бұрын

You are welcome!

Thanks for sharing. Inetresting stof :-)

@AndreasSpiess

6 жыл бұрын

You are welcome. I was really impressed when this happened. Maybe it helps somebody else...

Use a dremel tool with a grinding stone to roughen up the battery terminals and wires will solder much more easily to them.

@AndreasSpiess

6 жыл бұрын

Thanks for the tip. Actually, it was easier than I thought.

Great video (y)

@AndreasSpiess

6 жыл бұрын

:-)

I like that you circle the thing youre talking about at 3:50 like we dont know which is which =P

@AndreasSpiess

6 жыл бұрын

LoL I was not sure if it was clear to everybody ;-)

A complete TP4056 board is around $0.40 too, it's also very small so the only benefit here seems to be getting more amps out of the cell. Which is not bad, but it seems like more work than adding the protection circuit to your project's PCB.

@AndreasSpiess

6 жыл бұрын

The biggest advantage for me is, that it becomes a part of the battery

Hi Andreas, Soldering batteries might be damage inner structures. You can put batteries in the fridge. After some time you can take them from fridge and begin to solder. Since it is cold, soldering will not harm inner structures.

@AndreasSpiess

4 жыл бұрын

Theoretically you are right. I think, it depends on how long you solder. Mine never got hot.

I recently began looking into 18650 and powering a project with it. Thing is, if I finish it the batteries will be really close on my body and all holding devices are designed for unprotected batteries, protected ones are slightly too big for protected ones. I hope this‘ll work out for me and thanks in advance for the video (maybe make an updated one if there are new parts on the market? Or maybe for better audio)

@AndreasSpiess

2 жыл бұрын

I know the problem of too big protected cells...

Great video! The fire brigade should send you a basket of Toblerone for making their life's easier. Is there somewhere a schematic available? Would be nice to know how it works and integrate it into a PCB design.

@AndreasSpiess

6 жыл бұрын

I will post a link in the description

Hi Andreas. I really like your videos, good job. Can you maybe provide a link to these kits?

@AndreasSpiess

6 жыл бұрын

Should be there now.

I just wanted to thank you for this video. If I hadn't stubled upon it in time I would possibly be a child murderer of 4 children this christmas. I'm an amature in electronics but I designed a LED lamp circuit that I'm going to put in a 3D printed night lamp I partially designed. To power it I'm using a 18650 battery and I bought an over voltage charge protection circuit board and after watching your video I realized I also have to have under voltage protection especially because my circuit will draw a small current even when the LEDs are off. Thank you for helping me not murdering my baby relatives!

@AndreasSpiess

3 жыл бұрын

It is a good idea to add undervoltage protection because completely discharged LiIon batteries cannot be charged with standard chargers.

I'd like a more detailed explanation on how the overcurrent protection works. If I've understood correctly the DW01 measures the voltage drop through the mosfets and compares that to the specified overcurrent detection voltage? If this is right then you'd need information on the Drain-Source On-Resistance in respect to the battery's voltage applied to the gate of the mosfet and the voltage drop that comes from the fet's diode?

I think you misunderstood the schematic for the DW01. IC Fortune labels BATT+ and BATT- but they mean those points would be your new battery connections (BATtery Terminal I think) with protection between it instead of literally where you connect the + and - of the battery cell. On their schematic where the battery icon is placed, that is the place of the battery. They have the exact same diagram for their FS312F and it's confusing. If you connect the battery at BATT+ and BATT-, the chip probably won't turn on depending on the drain source leakage of the double N mosfet. For example the DW01 is often paired with the FS8205 but that only has 1uA drain source leakage while the DW01 requires 3uA to operate. If the battery is connected where the battery image is located, the chip will run if there is at least 3uA left in the battery. You can place the battery at BATT+ and BATT- and it would still work and that's why it's confusing. But then every time you replace the battery, you would need to short the ground of the chip to the ground of the battery or apply input once before the chip would turn on. IC Fortune also has a DW11-P and on that schematic it is labelled battery, VBAT+ and VBAT-. Foshan also has a DW01 and they also label it with a battery icon and the terminals are called BP+ and BP-. Diodes Inc their AP9101C is labelled more clearly with battery, P+ and P-. SII has the S-8200A and they call it battery, EB+ and EB-. Texas Instruments also has the same topology in the bq2970 and they call them CELL and PACK+/-. And for instance in their alternative topology like the bq294602 they call it VCELL and PACK+/-.

@AndreasSpiess

6 жыл бұрын

You are right. I mixed the things up. I apologize! I will post an updated version on my homepage and leave a link in the description

@Rizon1985

6 жыл бұрын

No need to apologize at all imo. Just looking around at schematics on the internet half the schematics have it turned around because it does kind of work even when you reverse it. It's a bit crazy that every manufacturer labels the connections with different abbreviations and even the same manufacturer that uses different labels. That shouldn't happen in such a technical field.

@noweare1

5 жыл бұрын

It took me a long time to figure out how those fets worked. Once I found out the Batt+ and Batt- terminals are the load terminals it was clear. I wish they just put a load symbol or something instead of Batt+ and Batt-, that makes it look like you connect another battery to those.

THANK YOU, THANK YOU, THANK YOU. How to do a "charge through" power system, most powerbanks circuites cannot charege themself "IN" while providing current "OUT" to load ?

@AndreasSpiess

6 жыл бұрын

I still have this topic on my list for a future video

Great video, but if I understand you correctly, It's also fine to use the TP4056 module (with protection ic's) in my projects in case I only need max 1A ?

@AndreasSpiess

6 жыл бұрын

Yes

Nice audio efect

@AndreasSpiess

4 жыл бұрын

Thanks!

thank u very much sir.if same has to be built with better ic what kind of ic i should use

if you want to increace the number of times you can charge and discharge and limit battery degerdationg limit voltage charge to 4.15v and discharge to 3v will alomst double the charge/discharge cycles

@AndreasSpiess

4 ай бұрын

Good point!

Good Morning Andreas 😀😀😀😀😀😀😀🇬🇧

@AndreasSpiess

6 жыл бұрын

Good Morning, Dean. I am a little late today because the night was short ;-)

@deangreenhough3479

6 жыл бұрын

Andreas Spiess I was a little early as waiting at the airport, but delayed by 2.5 hours and still waiting😂😂😂

Great video as always! Top notch information that will save a lot of trouble for many people! I have all but one question, the P- is for the negative load so does this mean that by using the original - of the battery, you bypass all the safety features? +1 sub!

@bob95180

6 жыл бұрын

Did some digging in the datasheet provided by the supplier on Aliexpress. It answered my original question (P- is in fact by default connected to underside of the battery) but it created another question, what is P+ since I do not see any markings on the PCB. Or can you simply charge the batteries like normal -using both ends of the battery itself to charge with a TP4056? B+ positive electrode. B - connect battery cathode. P+ charge / discharge end positive electrode (charge end / discharge end sharing). P- charge / discharge end negative (charge / discharge end).

@AndreasSpiess

6 жыл бұрын

I think you find a diagram in the video. The battery works exactly lie an unprotected one at the end. Just protected.

@bob95180

6 жыл бұрын

Thank you for you reply! Great work!

Hello,Andreas! It is really a nice video. Great job! I would love to know, how do you know that the FS8205A limits 3A current? and parallel 2 limits 6A current?

@AndreasSpiess

3 жыл бұрын

I do not remember. Usually I read the data sheets.

U are aweome

@AndreasSpiess

4 жыл бұрын

Thank you!

@farukz.9904

4 жыл бұрын

@@AndreasSpiess i wan to ask something about lora i am thinking using lora in my model satelite i am a computer engineering student my model satelite will go up to 1km is there any problems that could happen with lora becuse i do not really want to disconnect my communication thanks for helping

Thanks for the video -- Very helpful. Two questions: Your fuming battery experience, was it over-charged past 4.2v or a failing cell (I don't suspect you'd over/under-charge so I'm betting on bad cell); And am I the *_only_* one hearing someone's chuckle at 2:12?

@AndreasSpiess

6 жыл бұрын

1. As said, it was completely, completely discharged. And it started to fume maybe half an hour after start charging. So, it was just a bit charged. I have other cells of the same batch and they were ok. Brand was Samsung 2. The chuckle came from the original video

Hello, Thank-you for this very interesting video. Unfortunately, the references to a store fore the protection circuit is not indicated. Can you give a link ? thank-you in advance :-) Daniel.

@AndreasSpiess

6 жыл бұрын

In the meantime I updated the comment.

@danielroibert5631

6 жыл бұрын

Thank-you :-)

It seems to be a large short coming that this wasn't int the standards , so now we end up with lipos with different sizes and different charging sockets

@AndreasSpiess

6 жыл бұрын

I totally agree!

will these affect how the batteries charge when in parallel and serial configurations? great video!

@AndreasSpiess

4 жыл бұрын

Not too much, I think. You anyway have to balance the videos in serial configuration.

Interesting - did not know that there was over current protection as well.

@AndreasSpiess

6 жыл бұрын

It is more a "short circuit protection"

Hi Andreas, nice Video. It might help me to reuse some older unprotected cells. Could you provide a link to those kits? Or a search term? Grüße aus Deutschland Michael

@AndreasSpiess

6 жыл бұрын

It should be there now.

@mykolazamkovoi7722

6 жыл бұрын

It seems that link to the kit is broken. It redirects to KZread red (?) page Edit: works fine, KZread just asks you to confirm redirect. On mobile device it's really hard to see those while the font is very small.

@Hasitier

6 жыл бұрын

Link works fine here

Hi, It must have been almost a decade i am fondling with these batteries. I am a doctor but DIY is my passion. I must have tried almost every kind of charging method to charge these batteries but have never succeed ed to charge it to saticefaction.Before 2 years i purchased a charger for these batteries but it did not include the adapter .! It was socket with some circuit in it,to which any 5v micro usb charging adapter can be applied. So i have used that couple of time, thence but not as much as i should have otherwise. My intension of telling all this is that luckily never ever any battery haveexploded as is a risk i am learning from your video,perticularly charging a completely drained battery!!😢. Will you please tell me where from to get that small chip and what is it named as ?. I can not end up without saying that yours is the only video where in i could see author replying each comment interestingly. This shows your passion and commitment towards your work. I am radically impressed. I don't know whether and when , i will be fortunate to have respose to my comment. None the less, Gudluck and Stay blessed as people like you keeps the system trusted and going over in this era of too muchprofessionalism.

@AndreasSpiess

11 ай бұрын

If you use a TP4056 module (link in the video description), your battery should be charged ok using a USB power supply. It has a DW01 and an FS8205A chip on board. And thank you for your nice words. At my age, I am happy that your profession exists, too ;-)

Hi Andreas, this is awesome. Can you recommend a product I can place between a regular 5V phone charger and a security camera 18650 battery so I don't have to remove and charge it all the time. The camera is a Reolink Argus 2, I could get a solar panel to do the job but the trouble is the camera is installed on the north side of my house and the panel will never get enough sunlight. Thank you!

@AndreasSpiess

2 жыл бұрын

I do not know your camera. I assume you have to emulate the solar panel with your charger and check if the solar panel already has a charger module inside. If so, you have to add one (or extract the one in the solar panel.

it is exactly what I was thinking of and then "ta-da!" there is a video about it :D buying already protected batteries is maybe safer but really boring (hahah! ) it is better to make it ourselfs and learn a lot by doing it !!!

@AndreasSpiess

3 жыл бұрын

:-)

Another great video. Thanks! I read somewhere that ideally Li-ion cells should be discharged to 3.7V (or some other voltage?) when put in storage. Presumably at that level they can be stored safely. What do you know about this? I have some old laptops in the closet that I haven't charged for years. Do you think charging them after many years could be dangerous?

@AndreasSpiess

6 жыл бұрын

AFAIK LiPos have a small self-discharging current. So, It might be that your batteries are completely discharged after years. If you try to recharge them, the same could happen as happened to me. But it is not happening always (see other comments).

@superdau

6 жыл бұрын

Usually (at least that's what I've seen) the protection circuit in a laptop battery pack disables the pack completely if one of the cells dropped below a certain voltage (I guess it will be the ususal 2.5V) and it won't even take a charge. If you don't need the pack anymore (a laptop that hasn't been used for years can't be that important ;) ), disassemble the pack and check the cells individually. I've taken a 4 packs apart recently (first time I did that, but I plan on getting more), all from laptops that haven't been used (and charged) for years. The cells in one pack were completely dead (some even at 0V or reverse polarity) and head corroded. But the cells out of three packs were fine (between 3.2 and 3.7V). I checked the capacity and in one pack the cells had about 75% left and in two packs they were at 90% (one of those was out of a laptop that was at least a decade old, if not 15 years). I charged the cells back up to 3.7V, paralelled them all up and they maybe lost 5mV over the last month (that rate explains, how they are still fine after such a long time). I don't know about the internal resistance of the cells, but considering I got the 90% capacity numbers by discharging them at 1A (which is about 0.5C) they seem fine.

@cbm80amiga

6 жыл бұрын

Storage voltage is different story. It is voltage where battery doesn't loose its capacity (beacause of used chemistry) so it is better for them to keep such voltage as long as battery is not used frequently. Most modern laptops have such option available in BIOS which prevents of too frequent recharging and charging only to 70-80% of capacity, when laptop is used mainly with power supply. Search for Flexicharge.

@pfeerick

6 жыл бұрын

I've had similar experience to superdau when taking apart several packs from laptops which hadn't been used for several years. The laptop clock / BIOS backup had drained the packs completely, and then usually the first cells in the series had degraded or would get unusually hot when charging, so I will not use them unsupervised or have discarded them. I know of the FlexiCharger option that cbm80amiga is referring too... I saw it on some enterprise-grade (as opposed to consumer grade) Dell laptops about 10 years ago... and thought it was a great idea to preserve the battery... but I'd love to know how many manufacturers actually use that now... as I suspect they don't give a damn, and want their customers to come back after replacement batteries. I seem to remember that IBM or HP had a feature in their software to periodically automatically run a discharge / charge cycle the batteries monthly when the laptop was on power, also as did Dell. Good features, but I'd love to know if they are still around. ;)

@superdau

6 жыл бұрын

I've seen the "charge to 50% to 70% only" (don't know the exact number) in a cheap Lenovo (helped to set one up for a friend). I'm sure that's quite common with other manufacturers as well. With li-ions cycling the battery doesn't really help its life. It is mainly done to give a somewhat accurate reading of the charge state. Most batteries have "logic" that counts the mAh put in and out (battery packs have those extra pins to talk to the laptop and report state of charge). After a full charge/discharge cycle the logic stores the new capacity values. That means that 100% when you buy the laptop is not the same as 100% after a year of use.

As someone certified to do component level work on things like avionics that corroded soldering iron tip and lack of flux when joining surfaces triggers me.

@AndreasSpiess

6 жыл бұрын

Good to know when I fly next time!

I got some protection boards and test it first, they will work. I order stripes, not round like you show here. Then i add this to an Li-Ion holder. I insert my Li-Ion cell to the holder, but it don´t work. To run my application i must do a short loading this Li-Ion cell (3,5V with low current to the output/input pins) and it works. But if i remove the batterie and insert it, it will not work again. So this boards can not be used like i am doing it ? I can also start the batterie by shorting the B- and out- pins, but this is not what i want.

@AndreasSpiess

4 жыл бұрын

I cannot help here. You have to test if your use case is supported by these boards.

great video. But i think its only necessary if a product you change the battery has no CE certification. Otherwise it doesnt make sense. Here in germany every product has an CE certification. It means every circuit in a electronic device has this protection itself. So it isn´t required to do it Additionally.

@AndreasSpiess

5 ай бұрын

I would not trust the CE sign. It is often called "Chinese Export" ;-)

The concept that has me puzzled is differentiating over current protection from short circuit protection. Does OCP have a time delay? Otherwise, a short circuit is obviously also an over current situation!

@AndreasSpiess

5 жыл бұрын

As you write, a short current is a special case of overcurrent. So they are treated the same way. I do not know how fast they switch off.

Personally, I wouldn't trust Kapton tape to isolate the positive wire from the negative battery shell if the battery is used where it will be exposed to vibration. It will almost always work fine, but if it doesn't and the battery is charged it will burst into flames.

@AndreasSpiess

Жыл бұрын

I agree. Vibrations need more care.

It gets confusing I think but IMO there must be a proper way... ie: If the battery is already equipped with protection, is it acceptable to have additional protection circuits in series such as built into the charger circuit, or is this possibility to be avoided in every case? I would think it's not acceptable?

@AndreasSpiess

5 жыл бұрын

Chargers do not have "protection circuits", they use charging curves. These charging curves have similar top- and bottom values like the protectors. You can charge protected and unprotected batteries with the same chargers.

@thisisyourcaptainspeaking2259

5 жыл бұрын

@@AndreasSpiess Agreed, however, some device batterys have built in charger circuit or is it just a protect circuit? I'm working with a device that has a strip pcb with one or maybe two IC's on it and integrated into the flat battery pack. I suspect it's a charge control and protect circuit both, integrated into the battery. I'll be looking closer but my guess is it's more than just a protect circuit. I plan to replace the battery with aftermarket to avoid price gouging. Will post a picture to help explain.