schwim

Chinese battery life is like Chinese lumens. The numbers don't mean anything. You'll never get what's advertised.

Of the brands you mentioned, I have a torrid history with two of them(Doogee and Ulefone) and would strongly encourage you to stay away from them. The Doogee takes the spot for the worst phone I ever purchased. After returning two for issues, when the third one bricked on startup, I demanded my money back. Problems I had with it was buttons not returning after pressing, screen death, battery refusing to charge over 50%, overheating, etc. During my ownership, it also came to light that Doogee's flavor of Android packaged malware that was sending data logged on the phone to a Chinese IP address. It's more than buying a crap phone, it's putting everything you do on your phone at risk. Doogee isn't the only one caught doing this, this is just what came to light as I owned that particular brand.

I would do as Steve B. suggested. Basically all major phone manufacturers sell phones rated for water resistance and when paired with a rugged case like Otterbox, will withstand more than a Doogee S60 ever would(keep in mind the lack of cases for those phones).