If you need some juice, this 6Ahr triple pack is for you.
These are very slim, extremely light weight batteries 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 2000mAh!
This solid 3 cell pack (6Ahr) comes terminated with a standard 2-pin JST-PH connector - 2mm spacing between pins.

Do not attempt to charge these with anything but a charger specifically designed for Lithium Ion batteries.

These three cells have been match for internal impedance and can be fully charged and discharged in parallel.

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

Note: Although these cells are rated for 2C maximum discharge, the wiring and connectors are only rated up to 1A, so be sure to take that into account when determining your power requirements.

Dimensions: 19x54x60mm

Weight: 110g (3.88oz)

Features:

• Rated to 1A continuous discharge
• 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