Excellent and clear instructions on how to test a button battery. Thank you.

Perfect! I was gifted a really nice electric "fireplace". (and some money) for a helping a fellow move into his new home. He said it may not work (hence the cash haha) got it home and found out after watching this and testing the battery that it was just a bad battery! works perfect now. good timing too it's starting to get cold out here!

Very helpful. Too many times, the random battery I have lying around will pass the test without load but fail when put in use.

@CoolKoon

3 жыл бұрын

Actually lithium batteries will almost always look good unloaded, even when they're pretty much completely empty.

Thank you sir. Does the data sheet come with the variable resistance box? What's the relation between voltage and resistance selected? Thanks

Great video! Thanks! I don't have a variable resistance box though

Hi , what voltage should a 1.55V battery be when full/empty...?

What is the purpose of the resistance box? Is it to put a load on the battery so it will show low voltage under load? Just wondering because that’s how we check car batteries. We have this big metal box with a analog guage that ranges from good to bad. You clamp the cables on the disconnected battery and push the button on the tester. Has a bunch of high current resistors in it. Puts a 80 amp load on the battery. Reason for this is because you can get batteries that will show 12 volts on a meter but hook the load and you find out instantly if the battery still has capacity and is capable of starting a car, or it’s ready to use as your core charge on a new battery.

Thanks 🙏🏼

this test and its parameters are for 3v batteries and i appreciate it, how ever all my watch batteries are 1.5v

@bayme5759

2 жыл бұрын

Take as roughly %7 percentage. For instance, if you take reference 3v battery then see 2.8 as it is not good battery because of %7 lost energy not enough. Roughly %7 of 1.5v = 1.4 v (throw away to battery)

my meter has DCV section.. ..BUT options.. 200m, 2000m, 20 , 200, 1000 setings to select from.. which do i use?

@conradica1

4 жыл бұрын

Use 20V, because a 3V cr2032 is between 2Vand 20V

The data sheet obviously shows two points where a test could be made - 4.7 K Ohm and 15 K Ohm. They show two tests and I presume the first is using a 4..7 K Ohm load but the second test what load is being used there ? It can't be 15 K Ohm for the second test as the variable resistance box is marked at 10 K Ohm which if you are familiar with electronics means the maximum resistance of the box is 10 K Ohm. With some clarification it would be a very helpful video but right now it falls short.

@mike_98058

3 жыл бұрын

If the battery can pass the test at 4.7k ohm, it will pass at 15k 0hm. The 4.7k test draws more than 3 times the current that the 15k test draws. (15/4.7 = 3.2).

Can anyone explain how the discharge time (hours) on that graph can be so much longer with a 15 kOhm load compared to a 4.7 kOhm load? Am I reading it incorrectly?

@drewwilkins9963

5 ай бұрын

More resistance means less current drained per unit of time. It may be helpful to consider the extremes first and build an intuition for resistance. At one extreme, you have a battery that is not connected to anything. In that situation, the only way to complete the circuit is through air. Air is a a poor conductor (i.e., high resistance). So the battery does not discharge much at all and thus takes months/years to drain. Now, at the other extreme, imagine you were to short- circuit the battery by directly connecting its positive and negative terminals to each other. There would be almost no resistance. The battery would drain itself almost immediately, except for the fact it would probably overheat first. The resistor is resisting the "flow" of current. The greater the resistance, the less current, the slower the battery will be drained of its energy.

Wanted to check a 1.5 volt.

The title is "How To Test A Watch Battery With A Multimeter", but it SHOULD be "ow To Test A Watch Battery With A Multimeter AND a variable resistor box"

@Delly_bean

3 жыл бұрын

you don't need a variable resistor, just a load in the circuit. I used a 100ohm resistor to test and it worked fine.

@josepeixoto3715

2 жыл бұрын

@@Delly_bean don't think so; unless you do it for a second, 100 ohm puts too much load on the battery (30 mA!!) ; the watch does not do that,or the battery would last only 4 or 5 hours (their energy is around 100 mA Hours to 150 mAmp-hours) Better use 15000 ohms or 4700 ohms; half of that if it is a 1.5 volt battery

Cause everyone has one of those tools...

@RErnie-gv1hv

2 жыл бұрын

If you go to a store that sells multi-meters, act right, give 'em money, you too can have one.