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.
Because everything must die and its only limited. It depends on how or what do you do to the battery.
A rechargeable battery only lasts for an estimated 300-500 uses. They are not meant to last forever.
not long
It all depends of the type of batteries and what you areusing them in.
about an hour
Lithium batteries can last one and-a-half to two times as long as NiMH batteries.
Rechargable batteries will not last as long as normal AA's, but, of course, can be recharged, and should last over a year.
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.
The batteries are over the counter watch batteries and they last twice as long as the battery put into the walker
Batteries should be changed every 6 months. Some can last up to a year.
Well they run on batteries so they kind of last forever if you replace the batteries.
7 hours
one minute
most battery last five years