So I finally pulled the trigger on the R5 Mark II after saving up for months and man, my bank account is feeling it. I have got a massive wedding shoot coming up in downtown Chicago this October and I am slightly terrified about the battery life since I have heard this thing is way more power hungry than my old R6. I am basically looking at two main options right now and I cannot decide if the upgrade is worth it.

On one hand there is the standard BG-R20 which is what, like 350 bucks? It does the job, gives me the extra battery, and makes vertical shooting way easier which is huge for portraits during the ceremony. But then I see the CF-R20EP with the cooling fan and the ethernet port. My logic was that maybe the fan would be a lifesaver if I am doing 8K clips or just long stretches of 4K 60fps during the reception but it is nearly 500 dollars. Is that fan actually gonna make a difference for a wedding photographer or is it mostly for hardcore cinema guys?

• BG-R20 (Standard and cheaper)
• CF-R20EP (Cooling fan version)

I am also wondering if anyone has tried using the older BG-R10 on the Mark II yet or if Canon totally blocked that with the new battery communication stuff. Budget is getting tight after buying the RF glass too so I am really torn if I should just play it safe with the basic one or go all out...