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I've never had issue with my batteries being to warm, but to cold is an issue, for warming electric battery warmers are cheap, simple an fit in tighter spaces then a water jacket would, water jackets also tend to spring leaks if not done right, then you have a water leak in your battery box!
If you have lithium batteries and want to do a fast charge on them then you do need cooling but again this is best done with air, Nissan just moves air around in their sealed battery box so they don't have to worry about dirt or moisture.
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