it comes with not one, but TWO rechargeablelithium-ion batteries. When one goes dead, its a simple matter of popping out the one in the mouse and inserting the other, and you're ready to go in seconds. The other battery can inserted in the charger, which plugs directly into a powered USB port on your PC.
You want steel check this out.Thermaltake Armor Jr (review)If I did not buy the Antec 900, I would have bought that one.