[snoeki]

I was just charging my ereader and thought: wait, I made a mistake. For me my ereader is empty when it hits the 25% energy left battery icon, but perhaps for most people this means: I can still read a lot.

So my calculations:

If you have a fully charged H2O with books on it and all books are indexed and if you have the light on 30% and if you have wifi enabled, you will get at least 50 hours reading without any problems. Perhaps a lot more, but it's difficult to test and I can't use my reading statistics to calculate because we have multiple kobo's overhere and we all use one account on all devices. So when my wife reads and I read the same day, the statistics get messed up.