Currently the bionic power generation is very player centric.
Player generates the energy by walking/eating/drinking. There are systems for charging the power from an external source with cable/batteries but they are usually backup systems and the usual aim is to power other tools with bionic power instead of powering bionics with external tools.
What if we combine battery system CBM and power storage CBM.
You install the battery system CBM. On its own it does nothing, instead it allows you to install batteries (“wear” them).
You would get energy by putting in full batteries. The installed batteries would also act as the power storage.
When a battery is empty you would take it off and put a new in.
You could install multiple battery system CBMs to use multiple batteries at once.
Installed batteries would incur minor encumbrance based on their total weight. Maybe even allow putting in a car battery with some encumbrance penalties.
(the current power storage CBM could be kept as non-encumbrance non-energy transfer option)
I think this would drastically move the bionic power out of player. Instead of using the player bionics as the power source you would be fully relying on an external power source and use the bionic as a power storage. It would make the system much more connected to the rest of the game.