Dead batteries in a remote why do they work when you spin them for a moment?
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If removing and reinserting a battery causes it to work, then the battery wasn’t dead.
The contacts of a battery and the remote are made of metal and over time exposure to air causes an oxide layer (rust) to form on them. But this layer is so thin that it won’t necessarily appear as obvious rust.
The oxide isn’t conductive and blocks the electricity from the battery.
The mechanical action of removing and reinserting the batteries scrapes off that layer of oxide allowing a connection.
This is the same reason that blowing on the Nintendo cartridge would fix it. The blowing didn’t do anything, if anything it made the oxide layer worse. It was the removing and reinserting the cartridge that fixed the problem.
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