I remember when I was looking for a extra battery for my 5DII...on ebay..and amazon.
Due to the fine video available from that camera and the extreme demands of video on battery “life” per charge...there were.... ..a total of 2 such batteries available at anywhere near retail price..
I need the next battery up from those- just checked em online at amazon- they are now $169 per battery- I shoot landscapes, with 2 second delay, mirror up etc- and I can get perhaps 6 hours or so (perhaps about 40-60 shots or so) before I need to recharge my battery
Would be nice to at least get a couple of days before needing a recharge (Note, I can shoot for days, perhaps a week, maybe a bit more, if I’m just shooting normal, ie no mirror lockup, no LCD screen, no 2 second timer)
I don’t do much video- but I’m sure it’s a massive drain o n the battery-