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coro_sk -> RE: charging a123 pack with nimh charger? (2/7/2008 10:48:42 AM)
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I am afraid of that answer is no, for sure. Even if they did survived 5 times till now.
NiCD and Nimh chargers mostly do not care about voltage at all, thus they may highly overcharge LiXX pack of any brand.
A123 (LiFe) chemistry is reliable and can withstand severe abuse, but using NiMH charger seems to me too much.
Overcharged cell(s) will die.
It may be possible to charge them as 3-cell 6V lead-acid using old charger, as the lead-acid charge uses the same CC-CV charge scheme based on maximum voltage. Final voltage for 6V lead-acid is somewhere near 2.45V/cell, which is close to 2x 3.6V (3*2.45=7.35, gives 3,75V/cell which is acceptable for A123).
It may be also possible to use A123 capable LBA10-A Hyperion balancer, which will break the charge at 3.9V per cell, with any source of constant charge current (including as simple as 12V car bulbs, hooked to car battery).
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