I've been a photographer for over 10 years and have used almost every manufacturer on the market. And as is my custom, I use the original battery for the respective system once and otherwise only third-party batteries. This time, however, is the first time I've used batteries from K&F Concept and yes, what can I say? The batteries are great! I can easily get through the entire day with my Sony A7 IV and both batteries (about 8 hours straight) and still have some charge left. In my opinion, these batteries are in no way inferior to the original from Sony and I can definitely recommend them. I particularly like the fact that you can charge both batteries at the same time, which is often not the case with other third-party manufacturers.

I have a lot of generic batteries and some fit well and some don't. Some were DOA and others were the last of my original Canon batteries. So far these feel like a winner. They charge quickly and hold a good charge.

Everything must be correct as all products from the K&F concept

Funcionam bem, now I have problems. This is the solution for a Sony A7iii

To be honest, I dislike The En-EL14 batteries for Nikon cameras as much as i do the NP-Fw50 batteries for Sony. These batteries have always had terrible battery life in my use cases. So having multiple batteries was always a must, to ensure that i was never up a creek without a paddle when i needed it most.

K&F has always done a good job with their series of batteries. I have tested their batteries across multiple camera brands and i have never had any issues with any of them. The only thing that can be said is that these do not give you the full battery life that the OEM will offer but the reduced battery life to cost savings over the OEM is worth it in most cases for me.

I used these batteries in my Nikon D5600 and D3500. I noticed more of a difference in performance in my D5600 battery life when compared to OEM than with my D3500. I took both cameras out with me while i walked around getting shots of nature for the day. It was about 95 degrees that day so i expected the batteries to die much faster, which did not happen. The batteries held up well in the higher temps and gave me a sufficient amount of shots. In most cases, i would never take over 300 shots when birding or anything of that nature but did on both cameras just to better access the batteries.

The biggest area that i noticed a difference in was when i left the batteries fully charged in the camera bodies and coming back 2 days later to one at 52% and the other at 39% when i had never seen the at much of a power drain on my OEM batteries when i left them in the body. Not sure why that happened but i know now to never leave those batteries in the body if i want them fully charged and ready to go.

Overall these are good batteries that fall slightly short of the OEM. It is also hard to find new OEM batteries, so amongst the deep sea of third party batteries, these are some of the better ones i have used.

I bought the batteries because the one battery that Sony provides is simply not enough for me. When filming at very high quality, the battery drains pretty quickly at 4K50. And with these replacement batteries, I can now film in peace without worrying. Charging is also pretty fast with this device.

Very pleased with these batteries that works great in my aging Nikon D5100 DSLR that can be picky about aftermarket batteries.

Pleased that the charger accepts USB-C charging and has big clear red / green status leds for each battery.

I’ve tried a few products from K&F concept and have been impressed with them all.

5/5 recommended

On the plus side, the batteries were accepted by my Sony A7iii without any error messages. The external charger is a real plus. I'm very satisfied with these batteries.

This is a pretty decent set and a good price. Compared to the OEM, the batteries retain their charge well and charge quickly.

There is not a lot else to say about this set other than it is a good product at a good price if you need additional or replacement batteries or a charger.

Fast delivery. Great product. Very satisfied.