Manufacturers' information implies that the life of a battery that is not abused depends upon the number of charge cycles it undergoes, specifying typical battery capacity in terms of number of cycles (e.g., capacity dropping linearly to 80% over 500 cycles), with no mention of age of the battery. Research by Professor Jeff Dahn of Dalhousie University suggests this common industry practice of merely counting cycles, ignoring the effect of age, is a poor predictor real-world battery life. In particular, a major contributor to the degradation of Li-Ions cell is the length of time they spend sitting at full charge, and with continuous cycle testing the cells are not left sitting with a full state of charge for any significant length of time. Battery performance is rarely specified over more than 500 cycles. This means that batteries of mobile phones, or other hand-held devices in daily use, are not expected to last longer than three years. But it is also quite possible to obtain lithium-ion batteries based on carbon anodes with more than 10.000 cycles.
Uplander wrote: I've never had one go bad and some of mine are 4 years old
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