An excellent article on extending Lithium Ion battery life
A lithium-ion battery provides 300-500 discharge/charge cycles. The battery prefers a partial rather than a full discharge. Frequent full discharges should be avoided when possible. Instead, charge the battery more often or use a larger battery. There is no concern of memory when applying unscheduled charges.
http://www.batteryuniversity.com/parttwo-34.htm
Found Via Larry O'Brien
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