Quote:
Originally Posted by HamishBoxer
My Cannon EOS20D which I bought a couple of spare batteries for, still has it s original 14 year old one and holds the charge as when new.
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I have several old gadgets with Li-Ion batteries in that are still working well beyond their expected life, including a small Samsung mobile which I bought in 2009 and, until very recently, was powered on 27/4 and still only needed charging about once a week, still with its original battery. When new, it would go for more than two weeks between charges.
But the established 'doctrine' is that Li-Ion batteries basically start dying from the moment they are manufactured, whether they are used or not. I normally find they keep their as-new performance for about two years, which coincidentally(?) is exactly how long they tend to be warrantied for, and then after that the charge time / running time usually gets gradually shorter and shorter.