I hope there will be a new upgrade or device that can be used in solve the problem about the lack of energy storage of power armors.
I have two ideas. First idea could be a upgrade for armor, that directly increase energy storage of power armor that applicate this upgrade. It also have multiple grades, different grades of these upgrades could increase different amount of energy storage. Second idea could be a portable device that could be held in player's backpack, provides power for armor through applicate batteries on it. When player have this device in the backpack, then the armor would consume the energy stored in the device first, and then consume energy that stored by the armors themselves when the device do not have any energy. When the energy in the batteries was completely consumed, applicate charged batteries would make it charge the armors that was not completely charged.The device of the second scheme can also supplement the power for the electric tools in the article column.