The latest in Airsoft battery technology. Li-Fe has a longer life cycle as well as better thermal performance (good performance in high and low temperature) than Li-Po batterys. During use in airsoft guns, thermal stability is very important since high temperatures can cause battery malfunction. Another important factor is the 9.9V voltage. For most standard Airsoft guns, an 11.1V battery is too high of a voltage for the motors and the gears and could ruin the gun. A 9.9V Li-Fe has perfect voltage for high performance Airsoft guns.Features: Configuration: 3 split-cell. (20 C-rating)Voltage: 9.9V. Capacity: 1400mAh.Weight: 115 grams.Hard case includedUltra-advanced Li-Fe battery technology.NOTE: You must use a Li-Fe battery charger.