Why are you acting like having to replace the battery is this super inconvenient thing that you'll have to do frequently
...I don't know how to be more clear about this. I don't want to be tethered to a cable. The only other way to charge it is by removing it. I didn't come up with this ridiculous suggestion. My suggestion was using a battery door, like my current Steam Controller has.
Especially if they go bad and leak all over the contacts or something. Crystalized battery acid is a pain in the ass to clean out.
I don't use lead acid battery.