The instructions say to let the new battery discharge before the first charge (it comes almost empty). It took almost 3 days to complete, which was longer than my old battery could last on a full charge. Experimented by charging all three and plugging one into a phone that wasn't charging. It has now been more than 2 weeks and the battery is still more than 50% charged. WOW, forgot how long a good new battery can last.
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