Well for me, I get the best battery life when I leave the device on all the time. My first charge I powered on/off a couple of times (in and out of my bag, we need a hardshell case!), and that seemed to drain a ton of power.
Now that I've just left it on, my battery life has been fantastic. I've gotta be near 1,000 pages, whereas my first charge went by after like 400 (abysmal).
Could also be that, like I've read, it takes a few charge/discharge cycles to calibrate.
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