After a while, rechargeable batteries are no longer able to hold a charge. What's the standard amount of time it takes for this to happen? Or--how many charges would have to occur before the batteries can't hold that charge or can't hold it for long?
by 
Molden Molt
ANSWERS: 4
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I can't give you an exact number, but they usually last quite a while. Longer than you'd expect. I have 4 double A rechargeable batteries from about 3 years ago that still work fine
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It depends on the type of battery. Some have a life based on charge cycles, some will have a life of a certain time-from-manufacture, no matter how many cycles. Ni-cad batteries develop problems if they are not fully discharged before recharging.
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try to get some l'ion batteries ,,,they are the latest tech,,,and have no memory effects,,,,
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NiCads : Highly dependent on how diligent you are about managing memory effect. I've had some that lasted over a decade (well over 1000 cycles) and still have >85% of their capacity while most people have no idea and can kill a pack within a few months (less than 200 cycles) NiMH : No memory effect to speak of and they are pretty robust. I haven't heard of many electric vehicle (EV) owners killing a NiMH pack even through old age. LiON : 2-3 years of average use, regardless of the number of cycles. Less at higher temperatures. They lose an average of 20-30% per year. Unlike NiCads, most LiON batteries have monitors in them to prevent overcharging or over-draining, and have no memory effect.
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