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The lipos in a volt have extremely small idle currents which is the bane of all batteries, aka self discharge. For a while my pack sat all winter at 95% max charge for a couple of winters and the decay is so small I can't accurately measure it. The BMS which increases the self discharge somewhat is disconnected but that's not a major impediment. There were packs that sat in a wrecking yard for years in a damaged condition which have a majority of still spec cells.
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