Quote:
Originally Posted by Akto
I wanted to have reference books (pdf "home made" nature and hiking guide books not available, mostly in french) and maps on my sdhc card to use during weeks long treks. The battery life falling down to 600 pages i.e. 3 or 4 days of use maximum is a great disapointment as I often travel away from any plug for a week. My solar panel helps but I would never have thought that a sdhc card would make such a huge difference for the autonomy of the reader. Very bad news.
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Akto,
You'd get a similar experience from other eReaders as any read or write to the card will draw additional power. Some eReaders may be better optimized in this respect (though I doubt it), but not using the card should yield better battery life in most if not all instances.
In the Kobo case (and I just don't know but that may be true of other eReaders as well), because the SDcard is a removable media it must be scanned for content whenever the device is switched on, or a card inserted (as you don't know that it is the same card or another one), and that will mean additional drain proportional to the number of books stored on it.
I know that is not the answer you seeked, but why not plan a little ahead and load in main memory those PDF files you need for the trek before you go? For your specific usage that would seem the better option... That and switching off the Kobo when you're done, of course, since you wouldn't incur the extra drain from the card at boot up time.
If you need to stick to the SDcard scheme, then I suggest you go to other parts of the forum and check on other eReader owners about their experience.
good reading,
François