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Originally Posted by Mrs_Often
Yay at getting a new one! But...
Oh my, 4 days!! That is horrible! You won't know until you've had a couple of full battery cycles though but still, doesn't look good  
As for sideloaded epubs, see below.
I'm absolutely positive that battery drain can be caused by a data file. I tested myself, and I know that kepubs are read by loading a full chapter into cache to accommodate fast page turning. So the longer the chapter, the more has to be stored in cache and the more battery charge is used. I have found two badly formatted kepubs so far that had multiple chapters per chapter (so lots of missing chapter marks), causing a lot faster battery drain than expected, and Kobo acknowledged this and also gave me a refund for both books. |
Sounds like customer service keeping the customer happy.
Really, these devices use memory chips to store the data in cache, and I am sure you can't power up half a memory chip. Sleep mode has to maintain the same amount of memory no matter what.
Quote:
Originally Posted by Mrs_Often
The epub version of the kepub drained the battery a lot less fast, so apparently either the epub reader is more efficient or an entire chapter isn't loaded to cache for epubs; I don't know how it works. So VelvetElvis, no, I don't think it's "just" sideloaded epubs that have these battery issues.
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Surely people having the reverse experience (i.e. blaming sideloaded epubs) shows something is wrong with the theory that it is caused by datafiles.
Quote:
Originally Posted by Mrs_Often
(If you'd like to try it out with kepubs: "Absolute Power" by David Baldacci and "Raven Black" by Ann Cleeves both lack a lot of chapter marks in the kobo store.)
And the sleep/off difference: yes, of course you'll get longer battery life if you power off instead of sleeping. But 4 days of battery life in sleep mode is ridiculous. And, comparing with my Touch: it's been on constant sleep mode now for 9.5 days, with a book loaded, and its battery is at 74%. That gives an estimate of 30 days of life in sleep mode.
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I have never left my Touch in constant sleep mode - too busy reading, so I can't compare, but I have never got 30 days out of it unless I power it down. I have it set to sleep, then power down, within an hour.
I have probably said my piece, about this now - so I will try to just read a see how it all pans out. It is an interesting thing - battery life...