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Simply because of the materials they're made from. There will always be degradation in rechargeable cells. Older Nickel Cadmium batteries suffered from 'memory effect' - which depleted their capacity gradually over time. Nickel Metal Hydride batteries don't apparently suffer this effect, and therefore last much longer.

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12y ago
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13y ago

Because everything must die and its only limited. It depends on how or what do you do to the battery.

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Wiki User

10y ago

A rechargeable battery only lasts for an estimated 300-500 uses. They are not meant to last forever.

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Q: Why do batteries not last as long?
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