This compact 7.4V Li-Po battery with its slim split-cell construction, lets them be placed practically anywhere in a AEG, even inside stock tubes and SOPMOD/Cranestocks. Despite its small size it still packs 1300mAh. 
The biggest reasons to use a Li-Po is its smaller size and better power efficiency. Most Li-Po batteries are about the same size as a mini-type battery and is equal in power to a large type NiMH battery. No need for battery slings, battery boxes, or big batteries strapped on to guns. Li-Po is a power source for small carbines, PDW's, SMG's, etc. that doesn't require you to spoil the look of the gun, or run the risk of running out of power in the middle of a battle.
 
Unlike traditional batteries, Li-Po gives a stable Rate of Fire, Through-out its use. Also, it is not necessary to discharge Li-Po batteries before charging them, allowing the battery to be charged in-between games.

  Battery specs:
Configuration: 2 split-cell.
Voltage: 7.4V.
Capacity: 1100mAh.
20C continuous discharge rate of 26 amps with 32.5 amp bursts.
Comes with align balance connector.
Dimensions: 21.5x 14.4x 130mm (0,9x0,6x5,2 in.)
Size compatible with mini-type batteries.
This pack is ideal for M90 to M120 upgrades.
Replaces a 8.4V to 9.6V NiMH pack.

To prolong the life of a Li-Po battery:
Never completely discharge the battery.
Stop using the battery the moment you hear the Rate of Fire goes down.
Charge the battery before storage.
IMPORTANT: you must use a Li-Po charger, no exceptions.
Length:101x2mm/4,1inch
Width:22x2/7x2 mm
Weight:65gr/0,1lb