Yes, I read Leica Q uses Panasonic batteries. Standardization is good. However when I checked the TZ batteries, they were same as gx7, which are bigger then the gm1/5 series... I have both batteries, but gm1/gm5 is the camera to combine with TZ series, not the gx7... At least the third party charger works for both.
Panasonic told me that they are going to use the micro USB port as a std on future cameras and the same will apply to the batteries. There will be fewer batteries so more cameras with the same battery...YAY!