Originally Posted by VelvetElvis
My GF's Glo has similar awful battery life. She only uses the light about 1/3 of the time, max, WiFi is always off. She reads probably 2 hours a day.
Might not help your GF, but my problem turned out to be the external SD card, I removed it and battery life improved dramatically. Still investigating whether it is the card itself or the Glo at fault.
Edit: I wonder if it is possible to tell from the time it takes to charge whether there is a battery problem? I.e. an abnormally long or short charge time might indicate a dud battery, normal charge time but short battery life might mean battery OK but a problem with the device using too much power. I don't know what the normal charge time is though. Mine takes about 2.5 hours from fully drained to fully charged.