Quote:
Originally Posted by John F
And what do the same manufacturers claim for a lifespan time? For example, one of my lion devices is about 3 years old, and it appears its life is decreasing dramatically, and it probably goes through about one charge cycle a week.
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I have never seen any figure given by manufacturers for lifetime due to age (ignoring charge cycles) but I would expect very much longer than 3 years if not abused by over discharge, or by random or manufacturing fault.
I have never had a Lithium Ion battery fail for anything other than what I assumed were charge cycles (e.g. in earlier phones when their batteries were smaller and so was easy to average a full charge cycle per day, so could expect less than 2 years expected life as not being unusual). The oldest lithium ion battery (EDIT: in fact, "batteries") I have around here still in use would be more than 10 years old.
Looking at another supposedly very touchy old battery type for which much (mainly rubbish) information appears on the internet, I have just discarded 6 NiCd rechargeable batteries from two torches the batteries for which I bought around or just before the year 2000 so around 20 years old. They were only charged when I thought of it, ignoring the widely promulgated claims of memory effect but never letting the batteries fully discharge, about 3 times a year so were well under their charge cycle lifetime.
NiCd and NiMH batteries (and most other chemistrys too) from my own experience and what I have seen are easily killed by being left discharged or close to it. My understanding is that Li-ion is even more easily damaged if fully discharged, so they are protected against being so but if left, as I mentioned, they may self discharge into full chemical discharge in which case I suspect their life will be severely impacted upon.