This well thought-out stackable shield sits on your standard Arduino-Uno-compatible development board and adds a portable, rechargeable power pack to your project. Add your own single Li-Ion / LiPoly battery, and you’re ready to go mobile.

Neat.

Specifications:

• Capable of supplying 500mA continuous current at 5V
• Micro-USB connector
• Optional Power Switch included
• Built-in Li-Ion/LiPoly charging circuit with charging/charged indicator
• Low battery indicator (2.2V)
• Stackable Shield design (Uno-footprint compatible)
• 53x69x2mm (2.1×2.7×0.08″)
• 12.5g

Note:

• ICSP port is blocked by the battery when using this product
• BATTERY NOT INCLUDED. Requires single 3.7/4.2V Li-Ion / LiPoly cell