Recently we also do soem testing for using a hardwire kit to charge the power bank.
Some power bank support quick charger, so they inform if you use normal charger the charging will be slower.
Some power bank support Micro USB and Type-c input, using micro-USB the input is 2A, using Type-c is about 2.5A.
Micro USB charging is too slow for use in the car, it is not useful.
With USB C PD, there are a lot of cheap 18W charge rate powerbanks available now, this is the slowest charge that is useful, but we really need 2x 18W charge powerbanks = 36W charge rate before it works well for visits to the supermarket car park.
There are also some 45W USB C PD powerbanks available, but most of these will not charge that fast, many will only charge at 18W and if charging from a car 12V source then the maximum can only be 36W unless the charger increases the voltage.
It is difficult to find any faster USB powerbanks than this, and the ones that are faster are expensive and probably don't charge faster than 36W from 12V car power. It would be possible to use a 100W USB C PD powerbank like the
Zendure if the charger increased the voltage to 20V at 5A, but currently this is going to be expensive, probably better to buy the Cellink Neo.
It is also good if the charger has a low temperature cut off, it is not good to charge a lithium battery below freezing (0ºC), it can cause fires, and most of these powerbanks do not have protection.
For the charging, we only need a USB C PD input. For the output, most powerbanks only have 1 USB C socket, so unless you can use that socket for input and output then we have to use USB A, but the dashcam does not need much power anyway.