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Old Jun 27, 2015, 09:24 AM
Vinnonet is offline
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Powerlab 8 v2. Help! Nimh batteries not charging to full.

Hey guys,

Its been about 2-3 Years now and i got all the rc stuff back out.

charging up nimh batteries again, it cuts out in like 10-30mins and puts about 100-300mahs back in.

Ive tried 0.1/c and 1c charge rate. Nimh batteries ranging from tx controller to rx starter box batteries.

Anyway one? Surely all my nimhs arent dead and im missing something?
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Old Jun 27, 2015, 03:14 PM
JohnWilliamson is offline
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This charger has a lot of "error" messages for things that it doesent like. So what does it say when it ends???

So your batteries are old, may be voltage too low (error)
Maybe voltage climbs "too" high (another error)
Internal resistance too high?
Cell count "error" due to cells being both flat, a little high resistance?
Or something similar.
Settings?
Increase mV delta peak value to a high figure, charge at about 1/3rdC based on CAPACITY of cells. Or trickle charge at the 14 hour rate.

Make sure all the timeout, charge timouts etc are configured to max or you will get more "error" messages...
check cell count, charge partly with another charger first?
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Old Jun 29, 2015, 08:39 PM
Gregor99 is offline
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Originally Posted by Vinnonet View Post
Hey guys,

Its been about 2-3 Years now and i got all the rc stuff back out.

charging up nimh batteries again, it cuts out in like 10-30mins and puts about 100-300mahs back in.
This is normal for NiXX cells that have been sitting for a while. When NiXX cells are new, or have been sitting a while, they need to go through a "forming charge". This is slow charge at 100ma-250ma. It cane take 12-16 hours. Do this at least once, maybe twice. After that, you can return to fast charging the pack.
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Old Jun 29, 2015, 08:41 PM
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Originally Posted by JohnWilliamson View Post
Increase mV delta peak value to a high figure,
I wouldn't do that with NiMh cells. It can lead to overcharging the cells, and damage of the charge rate is high enough.,
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Old Jul 02, 2015, 07:35 AM
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Quote:
Originally Posted by Vinnonet View Post
Hey guys,

Its been about 2-3 Years now and i got all the rc stuff back out.

charging up nimh batteries again, it cuts out in like 10-30mins and puts about 100-300mahs back in.

Ive tried 0.1/c and 1c charge rate. Nimh batteries ranging from tx controller to rx starter box batteries.

Anyway one? Surely all my nimhs arent dead and im missing something?
I'm not a fan of NiMh. I've they've been sitting for years w/o being charged or cycled I'd replace them with fresh packs. Preferably LiFe if possible or packs using some of the newer low impedance NiMh cells.
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