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>>skille+(OP)
I feel like the elephant in the room is that there's no phone battery that's going to stay useful in anywhere close to that time frame, and replacing phone batteries is usually a losing proposition. I've tried, several times. Fake, low-quality batteries are rampant (usually degrading within weeks), and genuine ones are prohibitively expensive -- usually a significant fraction of the cost of a new phone.

>>wheels+B7
This was one of the reasons I selected the Samsung XCover6 pro. It still has a replaceable battery. It is also remarkably sturdy, which has paid off since mine has been dropped on concrete from hip height twice now with no additional phone protector and with no visible damage (apart from nicks in the plastic edge). It might be that the fact that the back explodes off on impact helps dissipate some of the energy? It is a relatively rugged phone for the slim profile though.

Another nice thing about the replaceable battery is being able to keep a spare around for quick recharge.