Battery Drain When Using RF Lenses On R Bodies

[katgal]

I have an R3 and an R5.  Due to my having a number of L-series EF lenses, I didn’t rush out and purchase an RF lens.  I’ve had no trouble using the adaptor.  Then, recently, I had the chance to get an RF 100-500mm lens.  Since getting it, I’ve used both my R3 and my R5 cameras with the lens.  In no time, either camera begins to experience rapid battery drain.  This issue doesn’t occur at all when using the R bodies with any of my EF lenses.  Does anyone else experience this?  If so, are there solutions?

[justadude]

I had a recent problem with the IBIS on the R6 Mk ll.  I did a lot of testing this and that over the past month before getting the problem resolved.  What I did notice during all of the testing is that my battery life was reduced significantly with continuous AF on with any RF lens with IS... compared to the manual lenses I used with IBIS and continuous AF turned off.  

From everything I've read, the IBIS and IS themselves have only a small amount of extra drain on the battery, so in my case I'm guessing it was the continuous AF that was the main culprit.  That may be the case with your situation as well.