Originally Posted by Kiwimick
I read on average 2-3 hours a day and I only use the sleep mode and have been getting around 14 days going from full charge to no bars.
You are getting 12 days going down to 2 bars and reading 3-5 hours when you use sleep mode? either I have a rubbish battery or you have a great one.
Im not sure what difference how many books on your reader makes but I have around 550 on there.
If I delete most of them will I be more likely to double my battery time???
Yes, 12 days from a full charge to 50% used/remaining when putting it in sleep mode between sessions.
I'll be using sleep mode for the rest of this month to see what battery usage is like compared to shutdown mode.
I have 608 books loaded on 4GB SD card, no books in main memory.