Just buy the AA versions... I don't buy into all the rechargable packs versions, especially considering the continued restrictions on shipping and traveling with liion packs.
And packs can be opened and new cells put in. There are places that even do this for you. In any case, the five year old godox flashes that take packs still have new packs out there even today, for $40. So had I bought the v860II, I still would be fine. If not, I buy a new flash for $180, and sell my old one for $50 on eBay or Amazon (for those folks that can't find parts for their broken flashes).
There isn't a use case yet for flashes where buying Canon saves you money in the long run over proven third party flashes. I figure I could always theorize on things like this, or I can live it.
Strobes, OTH maybe... They fall into a different category. I do worry about my AD600 in the future and the replacement battery is so expensive even now.
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Now if we can get back to wireless, the answer has been given about how to control Canon wireless flashes and what device you have to get to do that.
However, if one is again curious about the other side of the fence, at least with Godox, there are 3 or 4 different transmitter styles, just depends on what you are looking for in a footprint or capability. Also, their flashes themselves serve as RF transmitters to the other flashes. So you can have a flash on your camera, and still control groups/channels to other flashes at the same time, which is nice. I usually do not have that configuration, I will just mount flashes on various stands when needed and use either the Xpro or the newest RF transmitter they came out with, which has a simplified design. These also then work with my 3 AD200 strobes and my AD600, all seamlessly. It has really freed me up to be creative in how to design out a photo area, no cords on anything, and then set up usually 3 groups.
These little flashes are pretty amazing for the price. $70 and you get a full RF system (transmitter embedded) with these. I use these for a dual macro flash setup, more than enough light for that. I also use it as rim lighting behind my subjects, using very small portable manfrotto stands.
https://www.bhphotovideo.com …rorless_camera_flash.html
It's big brother (which I replaced my 580II with) is $100 and has the same capabilities.
https://www.bhphotovideo.com …ttl_camera_speedlite.html
I have used the Xpro C in the past, but have moved to the 2nd gen transmitter from the old X1T.
https://www.bhphotovideo.com …_x2tc_x2_2_4_ghz_ttl.html
So for $230, you have two different powered flashes and a transmitter with full TTL and support in the Canon menu system.
I have 2 large flashes, 2 small flashes, 3 AD200 strobes and 1 AD600, for probably about $1500 in lighting and RF xmit expenses. I started with the AD360 units, but then I had to get a receiver later (AD360 version 1, no RF capabilities), and didn't like the battery system so much. Godox has streamlined their system so much since then. The AD200 units are some of the most versatile lights yet to date by anyone. Different flash heads, a Bowens dual unit mount to get a 400 strobe, cheap replacement batteries (price of an LP-E6), etc... pretty neat.
Canon has no system yet that can rival this ecosystem, and certainly not even close to the price points here. As long as you are pretty diligent in your purchases (get these on sale from time to time, keep batteries charged annually, every other year maybe go buy a new battery while they are out there, like you would with camera batteries, etc), you will save a substantial amount of money across 10 years.