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All batteries self-discharge, whether in use or not. The rate of that self-discharge depends on the particular chemistry of the battery. Alkaline batteries are among the slowest to self-discharge, NiCD and NiMH among the fastest. Car batteries which are typically lead acid, either flooded or AGM, are at the slower to self-discharge end of the scale, but they still do. When a lead acid battery is no longer at 100% state of charge, lead sulphate crystal begin to form on the plates. This is sulfation and is the leading cause of battery failure. This will not happen overnight, of course, but probably at a rate of approximately 5%/month.
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