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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.
What else can I help you with?
How long do batteries last in an iDog?
not long
How long will rechargeable batteries last?
It all depends of the type of batteries and what you areusing them in.
How long do most batteries last?
about an hour
How much longer do lithium batteries last than normal ones?
Lithium batteries can last one and-a-half to two times as long as NiMH batteries.
How much longer do rechargable AA batteries last, on average, compared to standard duracell batteries?
Rechargable batteries will not last as long as normal AA's, but, of course, can be recharged, and should last over a year.
How long do batteries last in a wireless XBox 360 controller?
The batteries in an Xbox 360 controller are rechargeable. When full charged, they will last several days. The batteries themselves are meant to last the life of the controller.
Do you use batteries for the PokeWalker or can you charge it?
The batteries are over the counter watch batteries and they last twice as long as the battery put into the walker
How long do the batteries last in most gas detectors?
Batteries should be changed every 6 months. Some can last up to a year.
How long do Furbys live?
Well they run on batteries so they kind of last forever if you replace the batteries.
How long does phone batteries usually last?
7 hours
How long do batteries last in prosthetic arms?
one minute
How long diesel car batteries last?
most battery last five years
