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Charge currents

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Douglas Wheelhouse 124/03/2019 11:58:40
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135 forum posts
20 photos

Hi to all,

Can someone tell me the safe charge currents for,

9.6 nihm tranny battery (eneloop)

4.8 2000mAh eneloop battery

12v pb battery

just need clarification, Thank you

Douglas

Gordon Tarling24/03/2019 12:11:05
225 forum posts
4 photos

Charge the two Eneloop batteries at 1 Amp or less. They CAN be charged at up to 2 Amps, but they tend to get warm at that level, so best not to. As for your lead acid battery - we need to know what type and capacity before making a recommendation.

Douglas Wheelhouse 124/03/2019 12:14:56
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135 forum posts
20 photos

Thanks Gordon for being so prompt, I appreciate it

Douglas

Don Fry24/03/2019 12:23:43
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3307 forum posts
40 photos

What sort of charger are you using. Does it try to detect if the battery is fully charged, or is it a dumb charger. Makes a big difference to how you charge batteries.

Edited By Don Fry on 24/03/2019 12:24:21

Douglas Wheelhouse 124/03/2019 12:31:07
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135 forum posts
20 photos

Hi Gordon,

Its a 12v 7AH lead acid battery

Douglas

Douglas Wheelhouse 124/03/2019 12:34:20
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135 forum posts
20 photos

Hi Don

Ita a Sigma touch 2 80w balance charger

Don Fry24/03/2019 13:04:55
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3307 forum posts
40 photos

The lead acid. A tenth of capacity, on the PB program. So that's 700mAh. That's conservative, and the charger gets to 2.4 v per cell and starts to slow the charge.

the enloops are a bit more complex. Your charger will try to detect a full battery, it's a very small rise in cell voltages, detected amoung rising voltages as the cell charges.

Bottom line is, the charger misses the peak if the charge current is too low. Most folk reckon to do it at about 1/2c, to c. So that's 1 amp to 2 amps for the 4.8 v pack. The transmitter pack, same maths, look on the side for its capacity.

C is the capacity of the battery as written on the pack, i.e. 2000 mAh on your 4.8v pack.

That sort of cell is not fussy, and if you were in a hurry, with your charger, you could double the charge current.

Edited By Don Fry on 24/03/2019 13:05:48

Allan Bennett24/03/2019 21:04:55
1479 forum posts
38 photos

As has been pointed out, a peak-detection Ni charger can miss the peak if the charge current is too low. But with too high a charge current the cells can heat up to their detriment. So for Rx and Tx Ni batteries, be they Eneloop or any other brand, I still prefer to charge at about 1/10C overnight. The charge rate is so low that it won't harm the cells if they become fully charged before the charge is stopped, and the long duration ensures that any cell that is lagging behind will have time for its voltage to reach that of the others in the pack.

Martin McIntosh24/03/2019 22:10:34
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2737 forum posts
1026 photos

I have found that to get maximum capacity into Eneloops, 600 mA is ideal. If I suspect a false peak I use an additional charge of 1A. Some quite elderly ones I have will still take 1850 mA/hr by treating them this gently. 2A will certainly not charge them to full capacity from flat. Fine for a torch maybe but not for my models!

Jon - Laser Engines24/03/2019 23:01:30
4442 forum posts
164 photos

I agree with martin and do my nimh's at .5 or .6amps. My bigger packs will take more but i am rarely in that much of a rush so why abuse them?

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