Rechargeable batteries are generally supplying power to much more demanding devices. This essentially translates to a larger, more steady flow of electricity. These batteries get much hotter than your portable Double AA batteries and the like. This type of battery is much more susceptible to corrosion and burning.
Over time..the rechargeable batteries lose their ability to maintain a charge. The fact that they are rechargeable and are constantly exposed to electricity means they burn out much more quickly..and their battery life begins to decline.
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