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I believe the main problem with the IMA batteries is that they become unbalanced over time and that they are susceptable to heat. The unbalancing issue is fixed with occasionally grid charging that equalizes/balances the pack. The grid charger is a DIY mod that hooks up to the pack and charges it. The heat issue can be delt with mostly by using common sense and not using the batteries when your car has been sitting in the sun all day, etc.
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