Power Management

We've ordered a charger and a couple batteries from adafruit.

Charging

• https://www.adafruit.com/products/1304 (charger) http://www.adafruit.com/datasheets/MCP73831.pdf (chip datasheet)

• Alternatively, a better IC would be the LTC4067EDE, which is more suited for USB charging. We ordered a sample and this should be here by 4/30/14.

Battery Regulation

• 3.3 V Low-Dropout Regulator. (low cost, high current, but not very efficient). These are easy to find.
• 3.3 V Charge Pump LTC3240EDC-3.3 . (slightly higher cost, low current (150 mA max), very efficient). Sample ordered.