Gaoneng 3000mAh2S is a battery designed to power FPV goggles. The battery has a standard DC5.5 connector that you can plug right into the goggles. However, it also has a XT60 connector. This eliminates the need for an adapter when charging the battery and you can also use the battery to power the FPV goggles via a long cable. There is a test button on the battery. When you press it, the LEDs will light up to indicate the battery is charged.