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I use alkaline batteries, since it seems the JBL doesn't really have good calibration for rechargeables. So far I get the low battery message after the battery indicator has been showing 1/4 left. I ignored it once and continued reading and after a few minutes the unit shut off by itself and I had issues reopening the book I was reading at the time of autoshut down.
After battery replacement I turned the unit on and navigated to my book - happened to be a DRM pdb that I had been reading with a larger 24 font size than the default 18. The file hung up on reload with a 149/24 pages indication and unit froze and wouldn't advance - I had to reset to get out of the loop. To get the book back readable I had to do a reset to defaults and rekey in my decrypt codes and setup again, but I got my file back readable.
Since then when the low battery message comes on, I carefully backout of the book, turn the unit off, and go ahead and change my batteries. So far I have restarted again with no problems. After the time of the incident above I had been reading my DRM Pdb books with the default font size ... no more issues and crashes.
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