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Basics Battery Information - 10
Keep the battery in a cool, dark place; do not store it for
longer than 6 months without recharging.
If you are using one battery: Completely discharge and
then recharge the battery once every 90 days.
If you are using two batteries: Swap the left and right
batteries every month.
Fully charge a replacement battery before using it;
Apple ships batteries in a partially charged state.