Dock Battery Charger For AT&T Mobile Hotspot Unite Pro / 2372 / Liberate / Elevate 4G First adjust the push plate to accommodate the size of your battery (battery not included); The push plate can be pull down fit various size battery (up to 76mm) as shown in the picture Place the battery on the push plate and align the 2 adjustable connector pong with the battery -/+ (If you can not identify the -/+ on the battery, it is usually the first and last charge connector on the battery) Simply plug the dock to a power oulet to start charging your battery. Charge status indicator LED ( Red LED indicate charging, Green indicate idle) If Red LED does not indicate, please properly adjust the 2 -/+ pongs connector with the battery -/+. If the battery have 3 or 4 charge connector, the -/+ are usually the first and last charge connector of the battery.