I used to think it was a "bug" initially. Your explanation makes sense.
I guess you could use a similar "phenomenon" we all have experienced some time or another when using alkaline batteries for remotes or whatever household devices.
For example, the TV remote. Some may have noticed that as the battery starts to weaken the remote doesn't seem to respond as quickly or as "strong. A good tap on the battery packs or simply removing and re-inserting the batteries seem to make the remote work normally again. This "battery power" didn't come from nowhere. Of course, this only works a certain number of times until you must exchange the batteries.
Well... maybe not a direct example, but I get it