When I leave one of my cars alone overnight, the batterys go dead, it is a clone, but my other two shens' batterys last forever when they are left alone. I could leave it one day charged fully, and a week later it will still work.
you can just let it drain itself if it does so if not you have to drain it manually It is also good to cycle your batteries if you dont fully drain them often this erases the memory you just charge the batteries fullly then fully discarge them a couple of times and they should hold a charge better
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