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Try leaving either newly bought battery on the charger (wall plug, not computer usb port) for a minimum of 24 hours before using. Then let it go down until the PW complains about low battery. Don't plug it in if it nags you, wait until it displays the screen with the "dead" battery. Charge again, then use as normal. The battery you let deplete completely more than likely has permanent damage from sitting around empty so long. This one you might be able to salvage, but I would leave it plugged in longer (maybe 2 days). See if that helps.
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