This is a very easy way to tell whether your old batteries are alive or dead.
Simply drop them from a low height and see how they land: if it's on its head, it means it's still functioning.
Dead batteries will land on their sides or topple over.
See also: Brits 'waste millions of pounds every year' by leaving gadgets on charge
Check out our other life hacks including:
How to fold a T-shirt in two seconds
How to remove price tags without making a mess
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