I have a 6D and a 5D Mark IV. I haven't used the 5D enough to profile its battery life, but in my experience with the 6D, GPS causes maybe 15% battery drain per day. And with the 5D Mark IV, it should use much less, assuming you take advantage of the new "mode 2" behavior that turns GPS completely off when you switch off the camera.
Extends shooting capacity for the EOS 6D Mark II; Provides an auxiliary shutter release button; Provides comfortable Handgrip for vertical format photography. Compatibility: EOS 6D Mark II EF 24-105mm f/3.5-5.6 IS STM kit, EOS 6D Mark II body, EOS 6D Mark II body refurbished, EOS 6D Mark II EF 24-105mm f/4L is II USM kit
Greetings , I agree with Ricky. I always have a spare battery and a spare card with me. I have a 6D2. Even when I'm using GPS, I've taken a thousand shots with one battery. However, this has not been continuous shooting, so bring a second battery to be safe. With two batteries you will have no
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