When you flash a custom ROM (especially Android), the governor settings are often set to "performance" by default.
Have you flashed your Passport? Did you get Android 12 booting? Let me know in the comments—or find me on the BB10 Telegram group. blackberry passport custom rom
The phone may run hotter than expected, and battery life is often worse than the original BB10 OS, as the system isn't optimized for the 3450 mAh battery in the same way, and the hardware is aging. When you flash a custom ROM (especially Android),