This three-stick Vapex LiFe battery fits snuggly inside most M4 stock tubes and most places a regular 9.6V NIMH would fit.
9.9V Li-Fe batteries are relatively new to the airsoft market, and bridge the gap between 7.4V and 11.1V Li-Pos nicely; where 7.4V is too little and 11.1V is too much.
These battery packs have a similar power to weight ratio to lithium-polymer (Li-Po) batteries, but are far more tolerant to over & under charging. In extreme situations where a LiPo battery may ignite, a LiFe battery will most likely just vent some harmless gas.
The stick measures 19.5x20x125mm, allowing fitment in compact spaces.
These battery packs are far superior to many competing brands, especially those low-cost types sourced directly from Far-Eastern retailers.
Warning and information label is printed on the battery.
Comes with a decent 1000mAh rating.
Ships with a hard plastic protective case.
Fitted with a standard small female Tamiya connector.
Requires the use of a LiPo/LiFe charger.
Great looking luminous blue wrap.
Please take a few minutes and read up on Li-Fe/Li-Po charging online for futher information.
We recommend the use of a charger like this.

Capacity: 1000mAh 3S1P
Weight: 87g
Wire gauge: 16/22awg silicon leads.

Li-Po/Li-Fe battery warning: Always charge your Li-Po/Li-Fe battery in a fireproof bag. Charge your Li-Po/Li-Fe battery on a hard, solid surface and away from other electronic devices. Only use a Li-Po/Li-Fe battery charger and never leave a battery unattended, even in another room.

Vapex

Vapex 9.9V 1000mAh 20C LiFe Battery - Small Stick