can charge his battery/makes a charger

(That is not an absolute limit. It’s just that the battery is only able to hold that much
power. In that case…)
The overpass seemed to have water pipes and power cables running through it and a
thick cable ran right next to Accelerator. He glanced across the surface of the cable to
check on the amperage and voltage running through it and then unhesitatingly removed
the outer covering of the cable with his bare hands.
He was going to recharge.
The concept was simple enough, but he of course could not use the high voltage current
running through the thick power cable as is. On his way to that overpass, Accelerator
had gathered a few metal plates, wires, and the like. By assembling them, he had created
a makeshift transformer.
If his calculations were off even by the slightest amount, not only would the choker-style
electrode burst into flames, his fingers operating the transformer could even be blown
off.
Yet he did not hesitate.
He quickly attached the transformer to the power cable and used a small cord to supply
power to his electrode’s battery.

- New Testament Volume 6 Chapter 6 Part 4