DTBaan wrote in post #18712325
it is poor. but I've dealt with low battery life with the original Sony a7. luckily enough the batteries are small so having 1-2 spare didnt take much bag space. for weddings and other events it is bad. you could be missing a shot while having to change battery.
I rarely miss shots because my cameras tell me battery life, or I know the models well enough to change in advance. I don't use grips anymore, and prefer to carry extra in pocket or bag.
Regarding the EOS R, it's rated supposedly around 370 shots per charge and 450 in power saving mode. If I found the right reference, the 5D mk iv is rated around 300 in live view. I always enjoy more capacity, but either of those is reasonable for my needs.
What the EOS R is actually getting for battery life is one bit of feedback I haven't read or heard yet. One website mentioned that a battery grip was available, but I didn't recall seeing one at Canon's website.
TeamSpeed wrote in post #18712287
I love it uses the LPE6 batteries, but it has the worst rating of any camera that uses the same battery, and there are many, dating back to 2009 or so.
RE what I wrote above, it sounds like the EOS R can get more shots per charge than the 5D iv using iive mode, which would be one way to compare two bodies using screens.