I'd come back after paying the small fee. I understand that you spent time on it and your time has value.

Doc, Im gonna steal your DIY battery load/capacity tester!

thank you for this very informative video ! :-)

have a Hailong 36v volt 13 AH battery. It does NOT have a USB port and is the old style 4 blade. My bike has a volt meter and today when I reinstalled it after recharging it, it shows ZERO volts and doesn't power on the bike. This battery has the charge indicator built in and it shows fully charged. I took it apart and and tested the voltage at the plug that powers the charge indicator status and it showed 41.4 volts. I have NO power at the output blades that feed/power the bike. What could be wrong? Bad BMS ??? a fuse I didnt see? any help would be greatly appreciated

Thanks for your efforts. I have 2 brand new H Hailong 48V batteries. I got a new bike with the best battery that I felt I could afford and my bike cam with 17ah (Dragon) with LG cells. The newer one I bought for longer rides is 15ah with Panasonic cells. Strangely they both read 54 volts but my bike only goes 32 MPH on the LG's and 35 MPH (34.9) on the Panasonic batteries. I think the Panasonic is lighter too but it may have less cells I'm not sure I didn't count them dogh. So anyway I cut both my USB wires preemptively and everything still works fine (except the USB lol). One was actually a plug so I just unplugged it and actually its a different design so maybe they wont have the same probs but I dont want it to drain constantly anyway. Thanks for the tip definitely appreciate it and I'm def gonna check out your other vids and subscribe.

So, you cut a red wire to the usb module, thereby cutting usb out of circuit, and that was your fix? I have exact same problem & symptoms but no usb, at least on outside of battery box.

I am waiting for your videos like for Christmas🎄 i am reviving 60v32ah battery today with bigger battery 72v today, i am going to use the hack i seen online to get some voltage to 60v and start to charge it as it suddenly shut down last week. Hopefully i will still have hands and face tomorrow 😂😂🤪🤨

@Makemrule1973

3 жыл бұрын

How did you get on reviving your battery ?

Can you help me fix mine 72v 40ah i left the bike with out charging for lime a month and the charger dont want charge

I have a question. I checked voltage in each battery cell on a 36v 500w e-bike battery, they were 4.3v in each cell, accepted 5 cells. Cells say they are 3.6v, 2500 mAh, 9.0Watts. 5 batteries read 1.2 volts when still in the pack. I figured they were bad, so I removed them. Then I checked them again out of the pack and got crazy numbers. Here are the numbers, Why? 5.6v, 1.9v 5.6v 1.3v 13.1v HELP PLEASE!

Hi, I have a battery that doesn't seem to be working. I have a full charge, but no voltage at the connector. I confirm that the leads are clean, any ideas what it could be?

Hi . I have a 36v battery and I checked all cells which was around 4.1 volts except the last one which was near B- and was 3.7 v . so are they faulty ?

Hey I got a new battery and when I fully charge it then go for a ride it doesn't last long (Bbshd motor 48v 13ah or so)

Hello sirs. I have a 48v20ah scooter battery, that I left on and drained all the way down to 28.4v and will not charge with my charger it came with.- my question is, -- battery its at 28.4v , and what volt do I need to NICAD trick it to then use my regular 58.4v 2ah charger? --- I am thinking 33-38v? I don't want to over charge it with nicad just enough to get it to read out on the original charger-- what is the proper stop v? Thanks man.

Loved the video, thank you!! I have a new hailong battery 36v 10.4 ah battery that shows 0 voltage on the multimeter but the indicator on the battery lights up when the button is pressed. You think it is the BMS going into safe mode and any ideas on how to reset it without having to open it up?

@TheBatteryDoctor

3 жыл бұрын

Seems like a similar problem. can also be a fuse.

@Makemrule1973

3 жыл бұрын

I too have a Hailong 48v 17ah full charged, lights up all bars but has no output. Switch it good and has 50v when tested at the charge port ?

@dathanneal3115

3 жыл бұрын

@@Makemrule1973 mine turned out to be a fuse issue. I opened it up, replaced the fuse (had to solder it in) and it works as expected. Let me know if you have any questions

@Makemrule1973

3 жыл бұрын

@@dathanneal3115 Opened up and found x5 linked cells all 0v, ordered new (and a welder) replaced the cells and all good now back up and running. :)

@dathanneal3115

3 жыл бұрын

@@Makemrule1973 great to hear. Enjoy

Hey i left my ebike like 2 months and my battery dont want charging can you fixing for me i know i can charge one by one or the all package but i prefer pay for

Unbelievable that it was that stupid USB port. What exactly was wrong with the usb port? Did it short out somehow, causing the BMS to go into a "safety" mode?

You did just cut the red wire to the usb module. So you didn’t actually repair it to its original functioning state. You got the battery working again, but is it true that the customer will not have a working USB port?

@dmichaelgould75

2 жыл бұрын

If that is the case with my 36v 15ah Hailong batteries is because of the USB port draining the battery, I don't use those ports anyway and also to reset my BMS as well. I had my batteries sit unused during the winter season and noticed even after charging, it still wouldn't turn on the bike. I thought it was the controller but when I used a new 36v 20ah Lifepo4 battery, everything came on. So I suspected the Hailong batteries BMS to be in a sleep mode. And disconnect the USB circuit as well. Thanks for the information!

@RobertAdams-ly5ku

Жыл бұрын

@@dmichaelgould75 Did that cure the fault

man where are you located

We're you located at

I found often similar problem in HL batteries, but no USB circuit. I check cells and everything looks ok but simply cant charge the battery. Charger lights become green after a few seconds. For me is BMS. Do you sell better BMS for those batteries? Buying from EU/spain

@RobertAdams-ly5ku

Жыл бұрын

Did you manage to fix the problem by changing the bms

@antonioduribaik

Жыл бұрын

yes, a better BMS and everything works fine. and many options of bms, with bluetooth f. e. the other are simply with chinese characthers on it

@RobertAdams-ly5ku

Жыл бұрын

@@antonioduribaik Thanks for letting me know

I've got a similar battery I'm trying to troubleshoot, when I go across individual batteries they all read about 1.5 volts.... Is that too far gone? Or do I need to de solder the batteries from each other to get an accurate voltage?

@rockrl98

2 жыл бұрын

Since the cells are all in parallel sets, it would be better to tear it apart and revive cells one by one, but idk what the chance are, it would sure work fine for running some LEDs, but you will only know when you know...

My hailong battery is stuck to my ebike, it will slide off like 2 cm and then hit a wall on the mount. No amount of forcing it off will make it budge, and I can't get the mount off without first getting the battery off. thinking of taking the cover of the bottom of the battery and dremelling out a hole where I can unscrew the mount and see what is happening with it.

@danpagejr

Жыл бұрын

2cm seems a little short but it doesn't slide very far anyway maybe a 1/4 inch before you can lift it up. It sounds like a contactor broke and its probably causing it to bind and get stuck. You're sure its not locked right? Do you have to take it off or can you charge it on the bike? I dont think you have much choice but to break it. Luckily you can get all the parts I think including a whole new case with keys. I would just charge it on the bike until it goes bad then it won't matter if you break it.

Could you please tell me, what voltage a 48volt 10 amp would be bike battery would be at 60 %, I would like to keep it at this voltage for winter storage.

@Batteridoktorn

Жыл бұрын

45-50V is fine.

Hi, I have bafang mid drive and baterrynis hailong.. i test the battery and output is 54v.. its full charged but on displaynit says 0% and not running.. i tried connecting other battery on my bike everything is ok.. what is the likely cause of the prob.? Thanks

@Makemrule1973

3 жыл бұрын

I had x5 bad cells giving me the same condition, the BMS shut the output down to save the other cells. It would show full on the indicator, would charge for a minute then go green, would show 0v output but testing at the charge port would show 54v.

I wish we had battery repair guys Iike you here in the UK. My 48v 18amp battery hoIds a good charge but cuts out under Ioad about every coupIe of minutes, if I stop and turn the battery off/on this restores power for another coupIe of minutes. My repair guys wiII onIy pIug a battery into a computer, if they can't do that they won't touch the battery. They most definateIy wont take the battery out of the case. Since my battery is a non branded battery I'm out of Iuck! I've now had to buy a new battery, not impressed.

USB module failure is a common problem on those HL batteries.

@saadialahmer2706

Жыл бұрын

Hi what is the purpose of a usb module in a ebike please ? Im confused

@john4x477

6 ай бұрын

Some batts have external USB port so you can charge your phone etc....at the expense of range!@@saadialahmer2706

@paulgtal

6 ай бұрын

You can charge various devices such as your phone laptop from the port etc.

my ebike has the same style of battery 48v 20a and after riding today i stopped and notice the screen turned off and then i swear i heard crackling sound underneath the battery case. i shut the battery off and rode down without it on and tried an hour later and it worked riding for twenty seconds before shutting off i didnt notice crackling this time but it was very windy and loud. what should i do? what do you think it is?

@richardevans9465

Жыл бұрын

did you find out what it was

@Day-dreamer488

Жыл бұрын

@@richardevans9465 yes im an idiot, the wires were aka the battery main wires were slightly disconnected and or had condensation. please check those! the red and and black and the yellow one etc

@kenttran5289

Ай бұрын

I have a similar problem. Turn on the power sw; a hard a crack, then no power. It turned out that I did a bad soldering job on the power out put pin. Good BMS cuts power when it see something like that.

@Day-dreamer488

Ай бұрын

@@kenttran5289 I was dumb and had the cables wrapped where they all meet and the main cable that attaches battery to motor the connector was loose but because it was so wrapped it didn’t check for a while 😂

I was riding my e bike uphill on pas 5 and it shut off randomly aftet the voltage got to 47v the battery charges and the display comes on but turns off 2 seconds later any ideas?

@TheHurtubise

3 ай бұрын

I have the same issue. Did you find a solution?

@D0SAGE

3 ай бұрын

@@TheHurtubise nope i just put the bike in my cellar havnt touched it since

My roommate just bought the exact same battery. It doesn't do anything right out of the box. Doesn't power anything. The indicator light doesn't do anything and won't charge. Bought it off amazon, amazon says they can't do a return and I can't get ahold of the manufacturer to replace or repair it. Could it also be the usb?

@RobertAdams-ly5ku

Жыл бұрын

Did you get the problem sorted

@malinkowge

Жыл бұрын

@@RobertAdams-ly5ku yes. I took the housing apart and a wire was disconnected. I soldered it and worked just fine

@RobertAdams-ly5ku

Жыл бұрын

@@malinkowge Thanks for letting me know

My battery (48v 13ah) only charges to 49-50v, and discharges very quickly (under 2 miles). Is this indicative of bad cells or a bad BMS? The seller won't refund me as its just out of warranty so I need to fix it myself.

@Cycle_in_style

2 жыл бұрын

Did you find out the issue?

@nmbk4247

2 жыл бұрын

Having the same issue, any suggestions would be appreciated

@bigalski1963

2 жыл бұрын

@@Cycle_in_style no

@antoniokutija9788

2 жыл бұрын

Check first why it charges only to 50v. Check your charger. Do you have a multimeter. The voltage of the charger should be 54.6v. How much are you pulling from your battery. If you pull alot of power from your battery you can drain it very fast and also if your battery is very old it can get empty very fast

@bigalski1963

2 жыл бұрын

@@antoniokutija9788 the charger is fine, outputs 54v. The battery pack has covered just 60 miles from new, normal road use powering a 1000w Voilamart hub motor. Its definitely not heavy use that's draining the battery, the battery is faulty.

Here's one 48 v 750 1000 w controller. Not using peddle assist or break cutout.motor. I've been over my ebike 19 times. All the phases are right and tight. The halls too. No shorts no opens. You start off a few blocks and it skips skips again then dies in 10 seconds or less. Remove the fuse, it's ok. Before the fuse is reset just toching the connections power comes back on? Done this 39 times. This time close to power I plugged in the charger. The lights came on. No it were not dead. Just hitting the controller with volts turns it on ?!?!! Wakes up? Then asleep again. I've cut out the fuse and wired direct just to eliminate the fuse holder. I do not think it is the fuse holder Why does cycling the power fix it for 5 min.? I think it's the controller. It's a couple months old like the rest