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Re battery: I charge nightly, have never had to recharge the first day. Uses 10 - 20 % in a day with my non-intensive use, would guess it's good for 2 - 3 days.
Sorry, there was a problem. Please try again later.Regarding water protection: Though the phone is described as 'waterproof', it is NOT recommended for long submersion as you suggest. I did find an article describing cellphone waterproofing ratings and according to the article, this phone surprisingly has better specs in this matter than the new highly-touted Galaxy S7. (http://www.trustedreviews.com/opinions/what-is-ip68-ip-ratings-explained). Basically the idea is to protect from accidental momentary immersion.
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