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NiMH batteries as used in hybrid cars have indefinite lifetimes. The charge/discharge cycle only uses about half of the full capacity of the cells, in order to avoid the regions near full and empty that cause the most damage to the chemistry.

They work down to around 0 F (-20 C), below which a regular lead-acid battery is used to start the engine.

by asdf on Wed Sep 23rd, 2009 at 11:26:02 PM EST
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