What makes one battery rechargeable and another not?
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To explain *why* a normal alkaline battery isn’t rechargable, it contains a small amount of water in it (despite being called a dry cell battery). If you connect it to a battery charger, it supplies enough voltage that the water inside the battery will split into hydrogen gas and oxygen gas (remember that water is H2O). Since the battery is a sealed metal cylinder, pressure builds up and can cause the battery to explode, catch fire, or leak.
Rechargeable batteries typically use a different liquid in them that doesn’t decompose into gasses like water does.
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