why completely used up batteries seem to have a small bit of energy again after some time.
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Batteries are like balloons.
A balloon that your Mom blew up for you is a fully charged battery and you can use the air that’s inside it to run your toy.
When the balloon runs out of air your toy stops, but if you leave the balloon alone for a bit it will inflate itself just a bit (this is depending on what the balloon is made of). You can then use that tiny bit of blown up balloon for your toy, but it probably won’t go far.
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Batteries are like balloons in a lot of ways. Leaving a battery on the charger is bad just like inflating a balloon to its max is bad as it will break. Same with leaving a rechargeable battery dead for too long, like a flat balloon eventually the sides of the balloon stick together and it won’t inflate, a battery that’s been dead for too long won’t recharge.
So don’t overcharge or leave your rechargeable toys or electronics dead for too long or they’ll break.
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