From what I know, the problem of Li-Po battery is when charging, not when discharging. For 4 years I use this king of batteries in my car and were no problem until now, only 3 batteries were change because of big numbers of charging cycles.
On a Tellur 30.000 mA (https://www.tellur.com/product/30000mah-compact-power-bank/) it works arround 20 hours at 0 C degree, and 26 hours at 15 C degrees. Its ok if you buy 2 or 3 powerbanks. My camera stay allways on powerbank (even if I drive) and when I park, the camera enter in parking mode...
Just buy a A139 dashcam on 2 ch and I dont get it how Parking mode works. Mention that I try to use camera without HK3 hardware kit, the camera is connected to a usb powerbank when parked (30.000mA powerbank). I attached the settings bellow and mention that with these settings the camera...