I have CF cards from my previous 1D Mk III, but use mainly the Lexar 128 GB CFast card I purchased with the 1Dx Mk II. I also have a 64 GB CFast card and reader that came with the camera. I can shoot about 5,000 full size RAW images on the 128 GB card. You need to use the new battery if you want to shoot at full 14 FPS. I have used my 1D Mk III battery when I know I will not be shooting 14 fps. I believe it drops to 10-12 FPS with he older battery. I would go with the Canon battery.... Don't skimp when you are spending that kind of money for a new body...

Best,
Todd Ferguson

I don't have the mkll.
In my mkl I use SanDisk Extreme Pro. Most of mine are 64 GB because I share them with my 5Ds. I shot fast moving sports but rarely use the high speed, and if I did, only for 1/2 to one second. More than fast enough for me. I always shoot raw. If my publisher is at the event then I shoot JPEGS to one card for immediate download to his laptop.

I only have 2 batts, so far I've had no problems. You can always turn of the LCD or put the review time to 2 seconds and the power off time to 1 minute and Only review if you feel you need to. That will save a lot of battery. Usually every newer model gets more efficient power-wise. To bad they don't make the AA battery holder for it.

I've never spent more than 99 cents for a screen protector. Go to the 99 cent store and get a cell phone protector and cut it. Snip the corners so it can't snag.

Enjoy it, it's a lot of camera.
You want to do some really bad-ass work, get the 200 f2 to go with it!!! LoL
SS

So, let me be sure I understand...

You plan to buy a $6000, 20MP full frame camera (and presumably some big, heavy, expensive full-frame-capable lenses to use on it) and you're concerned about spending $169 for an OEM LP-E19 battery. Is that correct?

Well, AFAIK, no one is making an LP-E19 clone... so you're probably stuck with buying an OEM battery for that camera.

Are you going to be shooting sports at a high, professional level? If not, have you considered a 24MP 80D ($1100) or 20MP 7D Mark II (which many pros use, $1550)... both of which are able to use a number of much smaller, lighter, less expensive "crop" lenses, as well as every FF lens made for Canon? Or, if full frame is really your "thing", how about a 30MP 5D Mark IV ($3300) or 50MP 5Ds-R ($3700)? Or maybe a 26MP 6D Mark II ($2000)? Just wondering. A side note... the smaller LP-E6N batteries all these models use cost $64 apiece for OEM... But there are various third party clones of them for $40 or less.

Memory cards... 1DXII has two slots: One for standard Compact Flash, the other for the new ultra big and fast CFast cards. Unless you want to spend a lot (128GB $350) for CFast, any quality UDMA 7 800X/10066X or faster Compact Flash card should give you very good performance for all but very long bursts done at the very highest frame rates. Shooting RAW with a 20MP camera, you'll get roughly 500 images per 16GB, so can select your cards accordingly. Personally I prefer to use a number of smaller cards (16GB and 32GB), rather than put "all my eggs in one basket" with a single, gigantic memory card. If a card is lost or fails for some reason, I'd hate it in any case but would much rather lose a smaller number from part of a shoot, than a really big card loaded with a full day or many days' work. Besides, it only takes a few seconds to swap out a fresh card. (I filled twelve 16GB cards with two 7D Mark II at a shoot last Saturday.)

Oh, and the LCD screens on most current Canon DSLRs are covered by "armored glass"... no screen protector is needed. In fact, those protectors are a bit of a pain in the arse. But, if you insist, apparently Vello makes one for 1DXII.