I'm "Canon" born and bred. Over the years, I've bought the Canon EOS 5Dmk1, 5Dmk2, 5DSr and 5Dmk4 all new and all from New York. Each time I bought a set of two, new official Canon batteries every time I bought each camera as I always use the associated battery grips for each camera. Now, some of those Canon batteries are getting tired and at some point I will buy an 'R' camera so wanted to buy descent, high power, replacement batteries. I've never really been a 3rd party equipment buyer, always opting to buy OEM gear (Canon) so this was the first time I've bought a 3rd party battery. I've heard so many horror stories of cheap Chinese rip-off versions of LP-6(+N+H) batteries, but these K&F batteries are superb! What I thought wasn't clear in the Amazon advert was, apart from charging via the USB cables, could these batteries be recharged in the official Canon charger and can they be recharged in a good quality 3rd party charger? YES, they can and they interface and operate/register with each of the listed cameras above as though you were using the official Canon batteries. I have no hesitation in recommending these cells. They are robust, reliable so-far, they don't get too warm when charging and they seem a very good quality product. They're not dirt-cheap for 3rd party batteries, but you get more than what you pay for with these......they are in a different league to other 3rd party batteries you find available and as such, they offer excellent value.