They're NiCad...
Sounds like they need conditioning -
I don't know how much time you have to spare, or whether or not you have a discharger, but I've brought a handful of really shitty batteries back into service by doing roughly the following:
- Charge at a low setting until they have taken all the charge they'll hold
- discharge (with discharger) until properly dead
- Charge at low setting (very slow is better) again until they've taken as much charge as they will
- Repeat a couple of times
Re-conditioning the batteries can help reverse the effect of the NiCd 'memory' effect.
I don't claim to know the science behind it, nor will I stand behind my procedure as the best method. All I can say for sure is that it worked for me, more than once. Remember to charge them at a very low setting. It'll take a full day to get a charge into the battery.
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