Sparkfun Electronics LiPo Charger/Booster - 5V/1A

The LiPo Charger/Booster - 5V/1A is a no-nonsense circuit for generating one amp from a Lithium Polymer battery at 5V. This LiPo charger is equipped with a simple booster circuit (which uses the PAM2401 IC), and includes protection diodes so you can run multiple cells in series for an extra kick. Battery charger and booster for a single-cell lithium polymer (LiPo); Generates one amp from a Lithium Polymer battery at 5V; Programmable Charge Current: 15 mA to 500 mA ; Adjustable Output Voltage: 2.5V to 5.0V