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Yes I dipped mine in my friends pool
Casio cell phone batteries last ranging from 3.3 hours to 7.7 hours depending on which cell phone you are looking at. G'zOne type s and type v last the shortest, while GzOne Commando lasts the longest.
Right now with the world of technology and smartphones I would recommend the Casio GZOne Commando. Although this phone is a bit on the high priced end it is very durable, has good screen resolution, has a variety of applications to add to your phone and also includes a good camera.