Oh, like a camping lantern then. Well I guess you'd want some idea of how long it'll last without being charged and it might be nice to know how bright it is. Here's a
guide to figuring that out.
Here's a lantern that supposedly lasts 10 hours and it has good reviews from owners.
http://www.amazon.com/Tricod-Black-Powered-Camping-Lantern/dp/B002N33VY4
Here's one that's a little more expensive but has better features and high reviews.
http://www.amazon.com/Wagan-EL2230-Powered-Outdoor-Lantern/dp/B000BQOPKY/ref=pd_bxgy_hi_img_b