Windows, tiles.
My char is in the car on a reading binge. Occasionally I cook up a meal. I had put a fully charged hotplate and a mess kit in the adjacent trunk earlier. So I keep reading, cooking, reading, cooking, sleeping, cooking etc. Then I start to wonder how the hotplate and the mess kit are doing… Turns out they’re still both fully charged… They’re both unmodified, running off of regular batteries… well, I mean, supposed to be.
Can’t explain that.
Edit: If I take one or the other device in my inventory, and choose to use that for cooking purposes, then the charges are used normally. But if I choose the device in the trunk, that one’s charges don’t get used.