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Wow – you guys are getting a lot more out of your batteries than I do. I finally decided to clock it carefully. I started out by having my irex plugged into power (and switched off) for at least 48 hours. It did show 100% charge when I started it up.
Total time: 6 hours, 44 minutes.
Usage during this time varied a lot, sometimes with leisurely page turning, occassionally frantically switching between documents, and I shut down and rebooted six times. Including down times, the experiment lasted about 54 hours. One odd thing: sometimes it would indicate a higher charge level on rebooting. The most extreme example: 31% at shutdown, 53% at boot six hours later. It warned of low battery at 7%, and shut down on its own six minutes later. Because of this effect, I strongly suspect that I would have gotten much less time, maybe only four hours, if I had never shut down.
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