Apple Battery Charger

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How long do the batteries last once charged?

Say I charge one set for spare when one set runs out. how long do they last just sitting around?

Or is it best to leave them flat and start charging when the battery in my item (keyboard/mouse) gets to 10% etc? then swap over and leave the old batteries until the next item goes flat

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    The batteries would last around 3-4 months depending on the quality

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