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I've seen that a lot with all kinds of batteries... they seem to "recharge" themselves slightly when off for a while. But it doesn't usually last too long.
Remember the battery indicator is probably just a volt meter for the battery power level which drops voltage gradually as the charge fades until it's not enough to power the device. Not sure, but isn't that how it works? So after being off, the battery can, for some reason, be "rested" and supply a little extra juice for a bit.
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