I'm a huge fan of Blackview rugged phones, they are incredible resilient. I'm about to pick a replacement for my current phone and the new BV9300 comes with a huge 15,080mHa battery (the iPhone 15 has a standard 3,877mHa battery). That would power 76 days on standby mode or 23 hours of binge watching videos.
The phone sells for $389 at Amazon, or under $300 direct from Blackview.