Using these in a 7d2 and at the moment they work just as well as Canon originals

I was a little apprehensive, but found out that it works flawlessly. It is also fast to charge and I love the indicator lights

Kit arrived on time, working, convenient in use. thanks

Bought these batteries for a Nikon Coolpix 1000 to replace original batteries, the difference is remarkable 100% improvement on longevity of charge and for the price compared with Nikon original they're a no brainer, definitely recommend

Excellent package of batteries and charger for my Canon R5. Works without any fuss and as it’s USB I can charge it from the car or Campervan.

A very lightweight charger that fits in any space in the backpack and charges two batteries on the fly.
I haven't compared charging times with those obtained with the original Canon chargers that I own, but if it's longer, I don't think that's a major obstacle to the needs and demands of a large number of photographers who usually leave our batteries to charge before going to bed.
I haven't had any charging problems with any of the batteries I use, both original Canon and second-brand batteries.
A product to make you satisfied with the purchase made.

I bought it to have two more spare batteries, so they already work like the original in my Canon R, I can charge the original battery in this charger and vice versa. Everything OK.

I've done a little comparison of some different batteries and the R5. Not scientific at all but some stats for battery life etc as I use the camera. The camera seems happy with the K&F Concept batteries and does not give an error about non-genuine batteries (unlike my 5DsR).
Right a bit of background of how the R5 uses a battery and its frame rate. If you set the camera to high speed continuous+ (green H+ icon) it has 3 modes - A, B and C which are dependant on how much charge is in the battery. Mode A (green H+) can achieve up to 12fps, mode B (white H+) can achieve up to 9.2fps and mode C (blinking white H+) can achieve 6.8 fps.
As a battery runs down the frame rate will move to the next lowest mode at certain percentages of battery power that's left. This is where I've tried to find out at what point different batteries change mode.
Now the numbers.

Canon LP-E6N battery (2+ years old) - Mode A works till the battery is at 46% (282 shots), Mode B then continues down to at least 5% (total 431 shots) I then had to change battery. Never reached Mode C.

Canon LP-E6NH (1 month old) - Mode A works till the battery is at 38% (399 shots), Mode B then continues down to at least 5% (total 462 shots) I then had to change the battery. Never reached Mode C.

K&F Concept LP-E6NH (2 weeks old) - Mode A works till the battery is at 75% (150 shots), Mode B then continues down to at least 5% (total 420 shots) I then had to change the battery. Never reached Mode C.

Obviously the genuine Canon NH battery is best but most expensive. The K&F Concept has less overall shots than old Canon N batteries but not by much and this test was all just based on one use of each battery. They may even out a bit more when averaged.

Anyway, if you need 12fps for the longest time then you have to get the genuine Canon NH battery. If 12fps for the first quarter and then 9fps for the rest of the battery is good enough then the K&F Concept batteries are awesome value for money. Personally I don't have a problem with the slightly reduced fps compared to spending £150 on a single Canon battery.
Of course if you go on to electronic shutter then you get 20fps at any battery percentage.
Hope that helps.

Bought this set as I am travelling soon and required additional Batteries for the new R6.
Purchased as others had reported the Battery info was recognised by the camera which was important to me.
Charged both Batteries and tested both, Happy to say that so far they are both working well and time will tell as to how long they perform.
For the price it gives me a longer shooting time and peace of mind while travelling.
Charger works great as well.

Great price, 2 replacement batteries , early days but seem to last as long as the very expensive canon batteries.
Can charge with a pd power bank which is ideal when no mains power is available