The truth is out there. Or perhaps in there is a better way of putting it, at least as far as batteries for laptop computers are concerned. The truth is that those expensive (and sometimes exploding) batteries are little more than repackaged Li-Ion* AA cells. And generally not the high capacity ones at that.
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We believe in the long term value of Apple hardware. You should be able to use your Apple gear as long as it helps you remain productive and meets your needs, upgrading only as necessary. We want to help maximize the life of your Apple gear.