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| Ev Archive for April 1998 |
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| 1190 messages, last added Wed Aug 08 18:42:06 2001 |
[Date Index][Thread Index]
Re: battery heating
>What happens if you batteries are unequally insulated?
Battery capacity goes up about 0.5% per deg.C temperature increase. If some
batteries consistently run warmer, they will have higher capacity and shorter
life. This leads to an unbalanced pack and problems like:
- the hot batteries artificially lower the pack voltage, so the charger
shuts off too late, and overcharges the batteries
- the batteries will be at unequal states of charge, due to temperature
induced differences in charging efficiency and internal resistance
- the cold ones go dead first (typically lower states of charge)
- the hot ones wear out first
Lee Hart If you would not be forgotten
4209 France Ave. N. Soon as you are dead and rotten
Robbinsdale, MN 55422 USA Either write things worth the reading
phone (612) 533-3226 Or do things worthy of the writing
e-mail XURQ03A@prodigy.com (Ben Franklin, Poor Richard's Almanac)
Re: battery heating
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