Depending on the USB-C charger :-) I have a 3A charger connected and usually charge 1-2 batteries at the same time. Duration around 1.5h for two batteries.
Hello,
If I'm not mistaken, the connectors are not the same as the NP-F970 battery.
There is a model for your battery but I have not found it on Digitec.
https://pts-trading.de/fr/patona-chargeur-usb-a-double-led-pour-sony-np-fm50-np-f550-np-f750-np-f970-5925?number=141525
Have a nice day
This also works with a powerbank.
The NP-FZ100 battery has a capacity of 2280 mAh, so the powerbank must have a multiple of that + a reserve for the losses that occur during charging. Unfortunately I can't estimate how high the losses are, about 6000 mAh should be enough if you reckon with 20% loss. If in doubt, better use a little more.
I can't say exactly, but I estimate that it takes between two and three hours, depending on the charge level of the battery. But it works well and two batteries can be charged without any problems.