Heat will without a doubt kill batteries faster, but too much current and heat plus high state of charge is what you really, really want to avoid. That's what was behind Honda's recall of the 2000-2004 Insight BMS/etc.
http://www.driveaccord.net/forums/at...3&d=1214150325
Quote:
What is the problem?
The integrated motor assist (IMA) system in your
vehicle assists the gasoline engine for better
acceleration. Over time, excessive overcharging cycles
of the battery that powers the IMA system can cause
early deterioration. These cycles are typically created
by operation of the vehicle in unique topographical and
local conditions where the IMA battery typically
remains fully charged.
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