The EM-J5-G3601 has two modes of charging. It can connect to any standard power outlet for quick charging. The other mode is induction, as long as the robot is in a starship or large building it will use the ambient energy to charge. It can also do the same with any other high energy source such as a vehicle, and power armor.
Direct charge takes 1 hours.
Induction charge is continuous, but if the robot is inactive it can recharge the power cell in four hours.