Question about Panasonic Hc V777

Should work with any USB charging port (unless you want to charge the battery outside the camera). The supplied part also seems to be just a simple USB charging adapter (5 V, 1.8 A).

I bought a charger for the batteries at https://www.subtel.ch/index.php:

Charger VW-BC10 for Panasonic VW-VBT190, -VBT380, -VBK180, -VBK360, -VBY100 (HC-V777, -V757, -V380, -V270, -V160, HC-VXF999, HC-W570, -W580) Charging cable Power supply unit.
SKU: 916211

I find it more practical anyway, especially on holiday - you can charge the 2nd battery while using the camera :-)