collar modification

He had lost to a Level 0 boy on the snowy plains of Russia, but he had been brought to
the Elizalina Alliance when he lost consciousness after the battle. It seemed that Level 0
boy had arranged to have the Alliance soldiers take care of him.
“My battery is...not bad now,” Accelerator said as he reached up for the electrode at his
neck.
The battery had been worn down in his repeated battles, but he had gotten a chance to
recharge it in a resting area. The voltage, amperage, and shape of the plug had been
different from in Japan, so he hadn’t been able to just use the device he had. He had
managed to charge the battery by taking apart a local adapter and modifying the inside.
Now that Accelerator had his usual battery power back, he spread the few dozen pieces
of parchment out on a wooden table.

- Toaru Majutsu no Index Volume 21, Chapter 5 Part 3