I don't know about the whole raw v jpeg and battery life issue but it must be a close run thing? Raws may be bigger but jpegs surely need a bit more processing and then saving? I've honestly never given it a thought before.
My Sony A7 seems to flatten the battery quicker than my GX9/GX80 so I usually take a spare but I never bother with my Panasonic cameras but I'm not a machine gunner. If I was or was taking a Panasonic camera on holiday I might take a spare or just stick to charging the battery every night.
I use raws in the hope and believe that the processing is more flexible for white balance, exposure, lifting or reducing this and that and the like.
To be honest I have never compared RAW vs JPG directly, only RAW vs RAW+JPG, so essentially with the latter, giving the camera 2 workloads and 2 writes. I guess it makes sense.
Quick additional question. On your Panasonics, do you ever use Electric Shutter? I'm not really seeing the use.



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