This rechargeable battery is used to power the Gravity 3-Axis Gimbal. On a full charge, the battery can power the gimbal for approximately 4-5 hours. Small LEDs on the back of the battery indicate the level of charge it’s at. Simply press the small button below the LEDs to make them light up. If all four lights turn on, it’s fully charged and if only one light is on, that means the battery is running low on power and needs to be recharged soon. To recharge the battery, simply plug the DC end of the Gravity 3-Axis Gimbal Battery Charger into the DC-in port of the battery.