The FatShark battery pack has a perfect shape to securely fit in a head strap. Capacity has also been increased yet again to 1800mAh and a balance lead has been added for charging off standard RC type chargers. The built-in LED power indicator will give you a charge level in just seconds. Doesn’t not include banana adapter to charger battery pack only! This battery works with all Fat Shark goggles Voltage: 7.4v Capacity: 1800mAh (13.3Wh) Dimensions: 63x19x31mm Weight: 100g Max Charge Rate: 2C