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1. It is determined by the remaining battery power and the environment. 2. it may lose partial power while being stored 3. For best battery performance, we suggest you fully use up and recharge the battery at least every four months. It's best to keep it recharged when it is not being used.
Sorry, there was a problem. Please try again later.Should be a pretty darn long time. It will lose some charge but not to the point where it is drained after a year or less. Had smaller power pack from different brand that help charge for 3 years. Lost less than 10% but all depends on room temp, etc. YMMV.
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