Go through a full discharge/charge cycle and repeat it every few months to recalibrate the battery. Also, take a look at this article which I found pretty interesting.
How to prolong lithium-based batteries
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Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.)
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