This phone from Sony has a large 5,000 mAh battery. Don't worry if the phone gets a bit wet, it has an IP68 rating.
From Sony Store
Sony Xperia 1 V – New Exmor T For Mobile Phone Sensor And 4K HDR OLED Display in Black
OnBuy
Sony Xperia 1 V XQ-DQ72 (256GB+12GB, Silver)
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