[Stephan SchulzNew Member Join Date: May 2012 Posts: 1 Currently using: Leica M, Leica S, Leica SL Offline]

It is always the battery with more remaining energy in charge of supplying the power. That means, at the end are both batteries empty, in the camera as well as in the handgrip.

But might be difficult to see that in real life, because S2 is running very long with 2 batteries…. 😀

[Stephan SchulzNew Member Join Date: May 2012 Posts: 1 Currently using: Leica M, Leica S, Leica SL Offline]