RunRyder - How do you check your batteries to see how much charge they have?

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e-Electric Batteries & Chargers > How do you check your batteries to see how much charge they have?

Saint728
Elite Veteran
Location: Sydney Australia Sponsored by: Quick UK

Does anyone know how do you check your batteries to see how much charge they have? What I mean is after you charge them and their sitting there, how can you tell how full your batteries are charged? I know there must be something that you can hook up to the battery that tells you how much mAh or charge is in them? The problem I'm having is that I discharge my batteries, then charge them up again. Some of them say they are fully charged, but it only says 2,100 went in. I'm running 12 cell Sanyo 2400 mAh NiCd packs, that are fairly new. The difference ranges between 1900-2100 that go into the battery from a charge. I have 6 batteries I use for my Logo 10. Any information will help.

Take Care,
Cheers, Patrick

01-02-2004 Over year old.

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z11355
rrMaster
Location: 10000 is enough time wasted.

unfortunately, you don't.

there really isn't an accurate method
other than pulling all the charge out
and putting it back in.

static open circuit voltage or even
loaded voltage testing is only a
gross indicator of battery state.

01-02-2004 Over year old.

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rscamp
Veteran
Location: Ontario, Canada

z11355 if that is indeed your real name

is absolutely right, Patrick. You can guess capacity based on typical self-discharge rates at the storage temperature for the particular type of cell used but that's about it.

With regard to capacity of 2400s, they are over-rated. They usually measure around 2200mAh, so you aren't too far off the mark. They get a bit worse with age of course. Conversely, 2600 NiMH cells typically give more than the rated value.

Lastly, I'm not sure if you are doing this, but it isn't a good idea to charge them and let them sit for long periods because this depresses voltage and accelerates cell imbalance and may increase the rate of aging (I'm not positive on that last one.).

Rob

01-02-2004 Over year old.

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e-Electric Batteries & Chargers > How do you check your batteries to see how much charge they have?

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