Note: You cannot recharge the expansion battery separately. It must be connected to the Powerstation A1780 to charge itself. 

Steps for recharging the 760 Expansion Battery:

• Connect the expansion battery to the power station with the supplied battery-to-host cable to activate it before recharging/using it for the first time.

• Simply recharge the power station to plug into any input ports (such as DC input, XT-60 input, etc.). It will simply charge the expansion battery 760. 
• The recharging sequence will be that the first Powerstation A1780 will complete charging itself, and after that, it will charge the expansion battery 760.
• The connection is successful when the expansion battery icon appears on the power station's LCD screen, and you will hear a beep.

If you have any questions, please contact us for further assistance.