This is a very small, extremely light weight battery based on the new Polymer Lithium Ion chemistry.
This is the highest energy density currently in production.
Each cells outputs a nominal 3.7V at 400mAh! Comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins.

These batteries require special charging. Do not attempt to charge these with anything but a specialized Lithium Polymer charger.

Battery includes built-in protection against over voltage, over current, and minimum voltage.

Note: Be careful with the JST connectors. They can stick in pretty good and tugging on them can damage the connector.

Dimensions: 5 x 25 x 35mm

Weight:  9g

Features:

• 2C continuous discharge - very high for low price
• Excellent long-term self-discharge rates (<8% per month)
• Robust power source under extreme conditions (-25 to 60C)

Documents:

• Datasheet (LiPo Cell)
• Datasheet (Protection Circuit)
• JST connector
• MSDS