Charging Less Than Discharge?

Wurkkos

jayflash

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Oct 4, 2003
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Two Rivers, Wisconsin
If you're discharging @ 2A the capacity indication should be real accurate because that's a good load. To maintain a cell's maximum capacity I think remembering that a low, ~0.2C or less (320mA for a 1600mAh cell), discharge rate will more completely drain them and ~ 1C for recharging. 2C charging may be too high; if the cells remain cool 3.2A should be cool, but that might shorten their lifespan.
 

john61ct

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Jan 17, 2017
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In fact optimal charge rate for longevity is 0.3C or lower.

As with discharging, any heat production from internal reactions detectable at the cell surface shows a too high rate.
 

NotSoBrightBob

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Oct 2, 2008
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Thanks Jay and John. I'm staying with 1C to charge / top off. The pack is getting slightly warm. I'm going to try a 2A discharge and see if the battery will cycle before hitting the charger timer limit.

Bob
 

jayflash

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I was mistaken about the Maha because it will also indicate some cells have discharged more than a subsequent recharging. This is with older AA & AAA cells, I believe. I'm going to have to keep some records and not go by memory to see if this happens with only old cells. I'm noticing discharge capacities 20% to about 30% greater than the next recharge. This is happening on three smart charger/analysers so I doubt it's charger error. I'll also check the internal cell resistances to see if that has a bearing on the backwards results.
 
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