I just got my R5 Mark II and its amazing but it feels way too small when I throw the 28-70 f2 on there. I have a three-day desert shoot in Arizona coming up and I'm stressed about battery life and heat. I'm looking at the standard BG-R20 versus that BG-R20EP with the cooling fan.
Is the fan grip actually necessary for long days in the sun or is it just a gimmick for heavy video users? I'm also tempted to just find a cheap used BG-R10 since I heard they're compatible but I'm worried about losing the new high-speed data features. Budget is super tight now so I can't really afford to get it wrong...
Honestly, if your budget is tight, I'd suggest you skip the older Canon BG-R10 Battery Grip. While it physically fits the body, it basically handicaps the R5 Mark II because it lacks the technical throughput for the new processing engine.
Re: "Honestly, if your budget is tight, I'd suggest..." - grabbing the SmallRig L-Shape Mount Plate for Canon EOS R5 Mark II instead of a full grip! It adds that much-needed height for your hand when using the heavy 28-70 f2, which is amazing. For desert power, just pick up an Anker 737 Power Bank 24K to charge via USB-C. Its way cheaper and works fantastic for long days!
Ngl, you gotta grab the Canon BG-R20EP Battery Grip with Ethernet and Cooling Fan for that Arizona sun! I ran it during a brutal 110-degree desert rally and the active cooling was amazing for keeping the sensor temp stable.