Xtar launched a Kickstarter campaign for their SN4-7 IN 1 AI Camera Battery Charger last month and easily reached their funding. I am posting this now because Xtar has started shipping chargers to people that have pledged, I am one of those people.
This charger will allow you to charger up to 4 batteries at one time. Which is great for anyone that shoots with an EOS R camera. There are also compatible chargers for your Canon DSLR.
As an avid photographer or videographer it is not uncommon to have multiple cameras and devices on hand at any given time; each that requires their own battery charger and exclusive battery pack. But taking all those with you means lugging around a bunch of extra bags for space or constantly having to swap out batteries or connections to get them each charged up on a single port. That’s why we developed the innovative and versatile XTAR SN4 Battery Charging Hub that lets you charge multiple batteries and battery types simultaneously at home or on the go, so you never have to worry about missing a great shot or capturing a beautiful video because of a dead battery.
Check out the Xtar 7 in 1 charger at Kickstarter
This campaign has already begun shipping and has been thoroughly vetted by myself and others.
Secondly, no one answers the key question. Does it actually do the job you want, which is to fully charge the battery to 100% of its capacity. I've never come across a 3rd party charger or a USB charger that will actually fully charge an LP-E6, LP-E6N or LP-E6NH. I've tried a whole slew of them and they only ever seem to get to about 90% and then give up. You then have to remove the battery and put them back on to top up. Even then they don't seem get to 100%. How do I know it's not fully charged, simple. Put it on the Camera and see what it reads as. I trust the camera to tell the truth with Canon original batteries.
So those who have used this charger does it do the job or leave you flat. I see above that it seems to have a problem with LP-E6 batteries anyway. Which would kill it for me.
and another for the alternate battery type, plus a USB brick would match any set of batteries and would be smaller in size and weight.
FUJIFILM BC-W235 Dual Battery Charger
That's the bottom line, how much power do you get from a battery after being charged and what does fast charging do to capacity of a battery. How does OEM compare?.
If you really need fast charging and it reduces battery life, many users might still want it, but they need to know when to expect replacement of batteries. I've seen fast chargers cut the life of a battery by 80% for AA rechargables.
Use a cheap charger at your peril, it can be more costly because of reducing battery life.
This is possibly as good as the OEM chargers, not sure exactly how good the Canon is tbh and suspect although it isn't bad at all it likely isn't the pinnacle either. Best we'll get for a set and forget no customisation needed style charger though, short of going intelligent hobby charger route. Even in the latter case ideally you need to know the exact chemistry of cells inside the battery as well as capacity so you can min max the charging especially since some terminate a tad higher just fine and require it to get the full capacity where as that is bad for many other cells life or can be problematic in other ways for some other chemistries.
Edit: With how I churn through batteries in the R and knowing the newer models like R5/R6 are similar and that isn't likely to change with future models I may just switch to using a dummy battery with d-tap plug on since I can get quality v-mount cells with much higher cap than grip and multiple E6N's/E6NH's for similar weight/size in my bag when I need the runtime. I find Canon batteries are overpriced compared to alternatives like that albeit the best I've found in the E6 formfactor.
There are cells with better density such as 21700 and maybe 26650/26700 if you're lucky that are better for single cell style uses due to increased density from size but per gram/cubic mm they tend to be behind the 18650's on efficiency so at equivalent space multi cell batteries they still lag behind especially since they also cost more. The tech improvements does trickle into larger cells first from what I've seen such as substrate film manufacturing improvements to pack more electrolyte in given space and so on. As for smaller cells they don't see as much development and are limited in how much you can push them so not all developments translate down in length or width for various reasons I wont go into here. 18490 are a really minor formfactor especially and cr123 or 18350 are likely to be more popular before them and you barely see the big cell makers like samsung, sanyo, panasonic and so on update them never mind 18490's.
If canon released a slim grip sans controls that was basically just a battery holder with a decent BMS in it that allowed you to put your own unprotected 18650's or 21650's in I'd be a very happy man but I can't see them ever doing that really.