Quote:
Originally Posted by Sweetpea
that 10 years is a bit on the very optimistic side of things... Generally, for more power-hungry devices (think phones and tablets), you'll notice a degradation after about a year or so. For a less power-hungry device (such as ereaders), it might be 5 years before you notice a degradation. My BeBook Mini (from around 2009) really started showing its battery age about 2 years ago. It wouldn't hold a charge for more than 2 weeks anymore (default drain, without using it)
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The question is why it is degrading. The degradation you see in the power-hungry devices is probably due to loss of lithium ions due to plating from deep discharges/charges: the figure I gave is a (very) rough ballpark figure for internal resistance due to oxidation, which is a much slower effect. This proceeds regardless of battery use and charge levels, so the 5 years you report for the non-power-hungry device may be down to this (5 years, 10 years, basically the same: ballpark figure, remember
).