energyShield - Rechargeable Battery with Solar Charging and I2C Fuel Gauge for Arduino Charge with 5-10W Solar Panel, 5-24V DC Adapter, or USB 5V (1000mA) and 3.3V (300mA) Outputs 1200 mAh (4440 mWh) Lithium Polymer Battery Compatible with Arduino and Intel Galileo Can be assembled as Arduino Shield or Breakout Board (Some Assembly Required)