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Originally Posted by DawnFalcon
Um. Not really true. NiCad's energy density (MJ/kg) is ~0.15, NiMH batteries over doubled that, and Lithium Ion batteries can easily add half again over NiMH. There are trials with various materials right now which will add even more.
This isn't minimising things like intelligent cell-balancing, which has come into its own in recent years, but there have been advances in the basic medium as well - and fully working Lithium Air batteries have now been demonstrated.
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You are right, there have been some advances. But compare that to the advances in processing power, hard disk, and RAM sizes over the same period, for example. Those and other things have increased 10 fold or more.
And we will get incrementally better this and next year. But a lot of us are looking for a tablet that holds a charge for, at the very least, several days when used as a reader (since we compare it to the convenience we enjoy with current e-ink devices). So it is not easy to be satisfied with tablets at this point when the primary purpose of using one will be reading -- unless you are just using it at home.