Originally Posted by Edward M. Grant
Unless your vehicle has power outlets, odds are your tablet battery will be flat well before you reach your destination. An e-reader, on the other hand, can probably handle the travel and a week's vacation before it needs charging.
Well a) most cars do have power outlets (cigarette lighters), and b) how often do you driving more more than 10 hours before reaching your destination?
Reality is that a plain non-Touch, non-Paperwhite Kindle is advertised as 1 months use (*at half an hour a day, with wifi off). That is 15 hours of use, plus whatever natural battery loss you would expect in 30 days. Call it 20 hours of use.
That is twice the battery life of an iPad. Twice is good, but it isn't an order of magnitiude good. It isn't 'a tablet won't last the drive, but a Kindle will last the whole vacation' good.
The Paperwhite seems to have a much better battery, and works out something like 3-4 times as long as an iPad. Again, clearly better, but not orders of magnitude better.
eInk readers will last longer on one charge than tablets will, but not by the massive amounts that most people seem to think.
(Encouraged by deliberately misleading graphs like this from Amazon:
I note that they have cut that section out of the Paperwhite information on the UK site. I wonder if UK advertising standards have more teeth than US ones)