You can buy a universal Li-Ion charger at Radio Shack, but the best charger available is the Pila IBC, followed by the Xtar WP2 II. Whatever you decide to buy, make sure the charger features a CC/CV charging algorithm. Use high-quality batteries such as Pila or AW, and if you get unprotected batteries, make sure your charger is hooked up to a quality voltage regulator or line conditioner. I bought my Pila charger and AW batteries from lighthound.com.