Seeing how many people ask how to charge their batteries, i'd would like to share with you these links...

http://www.batteryuniversity.com/parttwo-34.htm

http://en.wikipedia.org/wiki/Lithium_ion_battery


I hope they help you.

And for the lazy ones that don't like to read, here's something taken from the links:

"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.)"

"Unlike NiCad batteries or NiMH batteries, lithium-ion batteries should be charged early and often. However, if they are not used for a longer time, they should be brought to a charge level of around 40%."