how to test 18650 capacity

[H.G.Sun]

how to test 18650 battery capacity.
I now find that budget battery tended to have over-rated capacity just like lumens from budget light.

[H.G.Sun]

@kreisler

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hi, kreisler!

[leaftye]

If you use a logging multimeter with good leads, you should be able to determine the capacity of a battery as it runs down.

This charger might also show you how much charge it puts in, which isn't the same as capacity. I don't know if there's a testing mode, but I doubt it.

[viffer750]

If you don’t want to spend money for that, just use an automotive headlight bulb for discharging batteries. Bulbs has a good feature, they make the discharge current curve relative flat. You also need a stopper and 1 or 2 multimeter monitoring the voltage and the current.

[wiljen]

I have a West mountain Radio CBA for testing battery packs, does a good job if setup right.

[H.G.Sun]

@kreisler

@H.G.Sun

hi, kreisler!

no way!!

H)

( i once knew a Sun from CN and he was a weight-lifting body builder. do you do d-bells too? )

no, I only weigh 51 kg.

[Kokopelli]

@leaftye

If you use a logging multimeter with good leads, you should be able to determine the capacity of a battery as it runs down.

This charger might also show you how much charge it puts in, which isn’t the same as capacity. I don’t know if there’s a testing mode, but I doubt it.

Although I have a hobby charger already, I used the logging multimeter at work for battery charge curve logging and saw it is the best way to see how things go with flashlights, battery chargers, discharge/charge curves etc. Any cheap yet reliable logging multimeters you might have noticed?