Reading outdoors in the daytime you don't need a light at all. Reading after sunset, you need the same amount of light you'd need for a book printed on paper. You can use one of the "headlight" style flashlight (UK: torch) or a clip-on book light. Besides, the headlight would be useful for other night-time tasks other than reading. Therefore, the basic Kindle (listed at 59 UK pounds today at Amazon.co.uk) would be sufficient. Instead of a headlight, you can purchase a cover which contains a light built in. Note that this cover draws power from the Kindle to power the light, so reading a lot in the dark will mean you'll need to charge it more often.
I would guess that the battery life claim on the Amazon site is probably predicated on reading no more than an hour a day -- and without turning on the internal light in the Paperwhite. I read 3-5 hours most days and my Kindle (Gen 3, aka Kindle Keyboard) needs to be charged about once a week to 10 days.
You can side-load books onto the device from your computer, assuming that they are in Mobipocket format and without DRM. Also, immediately after loading new books onto the Kindle, there's a lot of background activity as the books are indexed to support search. So, leave it plugged in overnight after you download new books or push new books from your PC.
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