Most of you probably have a bunch of batteries in a drawer somewhere that are not only a waste of space but can be dangerous if the acid leaks. I’ve always thought that the only way of telling if there’s any juice left in them is by hooking each of them up to a multimeter but there’s actually an easy and foolproof way you can tell whether they’re garbage or not that requires no equipment whatsoever – just gravity.
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Check out how easy it is if your battery is full just by dropping them. The best part of it is that it works with any kind of batteries.