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xorlof: I think you're going to have to bite the bullet and write a test app. Something that polls the server and downloads something, does some busy work to simulate processing, and displays something.
I suspect it will be unsatisfactory. Kindles get good battery from having a display that does not need refreshing and from sitting mostly idle. Amazon somewhere has published specs on battery life with and without Wi-Fi; that will give you an idea of what kind of hit the battery takes from just having Wi-Fi on. Another thing is the kindles you are thinking of using are old so you are starting with lowered battery life.
Any reason you want to avoid going the smart phone/tablet route? Do you have a no phone policy at the tournament? Your users look young and geeky, and it should be little problem to have them bring their own device. You can supply them with portable chargers and/or outlets as a courtesy. You just need to write the web app.
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