What is the expected lifespan of a rechargeable AA battery?

I use rechargeables for everything, and I have some that I've used for years and years. However, I have one now that seens to have completely stopped working. Even after recharging it fully (the charger shows a green light when charging is done), whatever I put it into doesn't work. If paired with another... show more I use rechargeables for everything, and I have some that I've used for years and years. However, I have one now that seens to have completely stopped working. Even after recharging it fully (the charger shows a green light when charging is done), whatever I put it into doesn't work. If paired with another battery the gadget may work for a very short time, though often sluggishly (like my tape player started lagging and slowing down the songs).

So do they just die eventually, all by themselves?
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