The DMW-BLG-10PP is a 1025mAh, 7.2V, lithium-ion battery that Panasonic uses in a few of their newer cameras (including the GX85). In the case of the GX85 kit, Panasonic opted to not include a battery charger. Instead, the battery is to be charged in the camera body through the micro-USB port. This is slightly annoying as the flap protecting the micro-USB port is not as easy to deal with as the battery hatch.
For those who want a standalone charger, Panasonic sells it as part of a battery and charger accessory kit. However, if you have a DE-A99(B) lying around (the charger from the GF5 and a few other older kits), it will work for charging the GX85’s DMW-BLG-10PP battery pack. The battery physically fits into the DE-A99B, and the electrical interface is the same (4 pins: -, D, T, +). Despite the capacity of the DMW-BLG-10PP being larger than what the charger was originally designed for (940mAh), the DE-A99B will still charge it.
[end of transmission, stay tuned]