Most batteries last longer than 2 years. I still have the original battery in the Creative Zen Vision:M, a portable video player that I bought about 10 years ago and it still holds a charge very well. I also have it's successor, the Zen Vision:W, which I bought a couple years later and it's still just fine.
I have 2 or 3 other portable media players as well, all with original batteries and all are working well. There was one other that I bought about 5 years ago whose battery was beginning to be fairly useless so I had to keep it plugged in. I gave that away a few months ago to a friend with some old movies on it.
It's kind of a matter of luck. The lithium-ion batteries are rated at between 500 and 1000 full charges and that more than doubles with half charges since they seem to do better with partial charges. I won't let my devices get below about 50% and I try to remember to charge them before they get as low as 70%.
Barry
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