There is an updated one called the 8849 Tank 3 running Android 13. It has major upgrades like a 23,800mAh battery, Dimensity 8200, 16GB of RAM and 120Hz screen.
It's targeted towards tablet users, but I still feel that there are way better and cheaper phone/tablet combos out there.
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You can try using Tasker to create a task that turns on NFC and launches Google Wallet / Pay afterwards.After that, create another profile to turn off NFC when the screen is locked.
This disassembly video suggests that it's using 4 batteries.