Bought these to use in the Canon 90D base grip BG-E14 which uses two at a time. Camera recognizes them as Canon LP-E6NH batteries and and gives full access for battery usage (no warning messages). Nice 2600 mah rating for extended shooting.

NP-FZ100 Batteries.
I can confirm these work well with Sony A7S III and A7C II cameras, absolutely no compatibility issues and the capacity matches the original OEM ones. Having shelled out almost £400 on six original Sony batteries (which are faultless by the way, just expensive) I thought I'd give these K&F ones a try, just to have a few backup batteries in my bag - and I'm happy to report they work very well...in fact I bought 4 of them. I took advantage of the special offer and got them for less than half the price of Sony ones, which makes it even better.
I initially thought the USB-C charging port was a but gimmicky but I have to admit when all your charger slots are occupied, being able to plug directly into a power bank or a V-Lock with USB port is pretty handy.
I will still go to my OEM Sony batteries first as they have proven reliability but these K&F batts are good enough to keep along side them on long shoot days.

I have never purchased or trusted an aftermarket battery beforehand, but these 2600mAh batteries are working great so far. USBc charging is a nice touch and I like the colour difference.

I'm surprised how long they last, noticeable longer than other brands and a bit longer than original Sony, works with FW 3.01 on a74 without any issue...so kudos to them

I love the fact that you can charge this with a cell phone wall charger and a c-type plug
Battery lasts longer than a Canon battery when you buy two at a time you save a little money they're awesome batteries I recommend very good product

You can plug these batteries directly into usb c charger making them very easy to charge they last well and are highly recommended

Tried using it and it last longer and the Canon original. The USB charging is great. May be Canon should use the same charging. The battery does not get warm or hot while charging or even if I leave it connected to the USB charging cable for 24 hours.
Will be having some major photo shoots. Will update if there are issues.
First impression really good.

I got two of these to replace aging E6 Canon batteries. They work flawlessly on three of my Canon cameras, EOS 7D, EOS 5D mark III and EOS R7. Later two are pictured. Highly recommended. Battery life more than the OEM and so is charging. USB-C charging is a life saver.

Exceptional Power and Performance:
The K&F Concept upgraded NP-FZ100 battery boasts a generous capacity of 2600mAh, delivering 7.2V and 18.72Wh. This ample power ensures extended video production and photography sessions, making it an ideal choice for professionals and enthusiasts alike. Its no memory effect feature guarantees consistent and reliable performance, providing peace of mind during your shoots.

Fast and Convenient USB-C Charging:
Say goodbye to the hassle of extra chargers. This battery supports fast and efficient USB-C charging, fully charging each battery in approximately 2.5 hours with a 5V1.5A input. The charging indicator light clearly displays the battery's status, ensuring you're always informed and ready for your next shot.

Wide Compatibility with Sony Cameras:
This NP-FZ100 replacement battery is perfectly compatible with a wide range of Sony cameras, including the Sony FX30, A7Riii, A7Riv, A7RV, A7Siii, A7iii, A7iv, A6600, A6700, A7C, ZV-E1, A1, and A9. Enjoy seamless compatibility with no pop-up error messages, ensuring smooth operation across different camera models.

Versatile Charging Options:
Equipped with a USB A to C charging cable, this battery offers multiple charging options. Charge directly using a power bank, wall socket, car charger, or other dedicated chargers. It's also compatible with Sony and K&F Concept NP-FZ100 chargers, providing flexibility and convenience for all your charging needs.

Safe and Durable Design:
Featuring a distinctive white and gray color scheme, the upgraded battery is constructed with a fire-resistant and durable ABS and PC exterior shell. It includes a safe and reliable circuit with stable voltage and current, ensuring added safety during use. Each battery is packed with a protective cover and USB-C charging cable, enhancing its durability and usability.

The K&F Concept 2600mAh NP-FZ100 battery is a powerful, reliable, and convenient solution for Sony camera users. Its fast USB-C charging, wide compatibility, and durable design make it a must-have accessory for extended video production and photography projects. Equip yourself with this high-quality battery and experience the difference in your shoots.

This battery is well-made and works perfectly on my Canon 5D3. This battery lasts noticeably longer than the old Canon battery on a single charge, which is understandable as the old battery has been used for over 10 years. It was quite fast to recharge but I didn't time it. I checked after 3 hours of charging and it was already fully charged. I like this battery because it can be recharged through a USB-C port so I don't need to bring the battery charger with me during travel. This battery is priced at £36.99 at the time of review, which I think is reasonable considering the build quality and USB-C charging port design. I would highly recommend this battery if you're looking for an affordable replacement.