How to prolong lithium-based batteries
Some tips on how to get the most out of your portable devices. The rest of the site also contains tons of information on batteries in general.
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.