4th Battery. Charging Battery and Remote

Have ordered a 4th Mini 4 Pro battery from DJI.

Regarding charging.

The charging plug I have has a stand USB port and a USB C port. I connect the standard USB port to my DJI 3 battery charger. But hoping that at the same time I can use a USB-C to USB-C cable to charge a 4th battery in the drone?

On a side note. If I use the USB-C to USB_C port and cable to charge the remote the charging lights flash across much faster than when using the standard USB to USB-C port and cable? Is this doping any damage please?

I have a better quality usb-c cable and it flashes faster when using it. Think some are just fast-charge cables, wouldn’t expect them to do any damage personally.