Originally Posted by Anorak
A123 is a unique chemistry as compared to other LiFePo.
there's only about 12 lithium ion battery mfg in the world. ALL use their own unique chemistry to make LiFePO4 batteries. so yes A123's chemistry is unique, but so is everyone else.
ALL batteries regardless of type .. if abused by severely overcharging, over discharge, etc. will probably have bad results. this includes LiFePO4. anyone that's experienced an explosion from charging gases from wet lead acid batteries will agree.
there's been documented instances of folks on RC forums. on purpose severely overcharging LiFePO4 battery packs that's resulted in fires. I've communicated with folks that's seen it happen under NDA. so they were not able to disclose how it was done.
Is it perfect? NO..fact is LiFePO4 chemistry is MUCH safer than Lithium cobalt cells.