Titan Power LiPo 1200mAh 7.4v 25C Stick T-Plug

Lipo

Superior Trigger Response
With the best discharge rate for airsoft, this means that Lipos have a very snappy trigger with a hard to beat trigger response

Higher Compatibility
Made in many sizes and shapes, Lipos can not only fit in most airsoft devices, they also have a much higher chance of fitting in the less common devices.

Safety, Maintenance, and Longevity Considerations
Lipos can be over discharged (used to failure), have a high puncture risk (which causes fire) as the plastic construction isn’t as strong, and will generally have both less useable storage and less total life that li-ion.