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Something most folks don't realize is that Pocket PCs such as iPAQs and the Axim don't ever really "turn off". What you're really doing is putting it into a sort of "sleep mode". That's the reason why you don't have to wait for the thing to boot up when you turn it back on. 2 hours of continuous use is about 50% of battery life (assuming you're using the battery it came with), so the remaining 2 days of off/sleep mode likely drained the remainder of the main battery power. That's why it's got the backup battery; if the main battery goes dead, the backup battery keeps the RAM refreshed so you don't loose your data. Thankfully, the backup battery (CR2032, if I remember correctly) is available just about anywhere and only costs a few bucks. I'm not sure how long it will last, though I haven't heard of anyone's backup going dead yet. Since all it would be doing is supplying power to memory, I'm guessing it'll last quite a while.
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