I charged both batteries (I used my canon chargers, but it’s nice that these come with an extra dual charger), put them in the battery grip for my Canon R5, and went for a walk to take some photos.

I’ve used several K&F Concept branded items over the years (particularly their lens mount adapters) and have always found them to be of high quality. These batteries were no different. They have a nice fit and finish to them and slotted into my camera grip with a satisfying “click” and no rattles, etc. They seem to match the additional power requirement of “LP-E6NH” designated batteries as advertised - as I would have noticed if they did not reach the top FPS speed of my R5. The batteries were also registered by the camera as OEM and all functions (charged state, frames taken, and recharge health) were all displayed in the menu.

I took quite a few photos at the fastest frame rate and wasn’t able to make a dent in the charge status - that’s a good sign. Time will tell whether their capacity is as good (or better) than the overpriced Canon OEM batteries, but their performance is great and it’s always important to have reliable spares.