I think there should be a way to permanently have the unknown overcharged device. Maybe something ludicrous like putting it in the oven for a week? It's just kind of annoying to have to keep charging it.
Viewing post in Voices of the Void 0.8.2 feedback
It isn’t truly infinite, but you can extend its overcharge time by continuing to microwave it after it becomes overcharged. I microwaved it for somewhere around 5–15 minutes and it lasted for almost a week, which only ended when I accidentally left it outside of a container for 20 minutes after cleaning out my inventory.