Amazing value, but battery last about 10% less then oryginal. Having said that it is fraction of the cost plus you get quick charger.

I've been using these batteries (for my a6000) and charger for nearly a year now and haven't been disappointed. Sure the batteries don't last as long as the original Sony ones but that was expected and they are much cheaper. Charger works well and is handy and still use the spare batteries all the time. If you're looking for some cheap spares then these are a good shout!

UPDATE: K&F Concept customer service was excellent and sent a replacement battery. This battery is fully functional. Updating my review back up to 5 stars due to K&F Concept's responsiveness and customer service, which can be hit or miss with overseas brands. I have no problem recommending K&F Concept as a responsible brand.

--- Original Review ---

Ok, first the Pros:

Small form factor
Charges batteries reasonably quickly - including the standard Sony brand batteries.
Easy USB-C connector.

Cons:
One of the two batteries was completely faulty and would not take a charge, right out of the box.

I've reached out to K&F Concept Customer Service and will update this review based upon the results of the resolution of the issue.

I have a Sony A6000 and it fits perfectly. The battery format is the same for the entire Sony Alpha line, even on those with a full-frame sensor; it's good to know if I want to upgrade my hardware one day and replace my case with a better one.

The charger and the two batteries correspond to the description. I've seen comments that said these batteries didn't hold a charge or weren't as good in quality as the official ones. For my part, I did not notice any difference and I emptied these batteries and the one that comes with the box several times. This is very reassuring and it feels good when you see the price difference between these and the price of the batteries produced by Sony (between 65 and 80€ each depending on the site)! )

A little extra: the charger for these batteries is so practical that I don't even carry the charger that came with the Sony A6000 anymore. I just have this one with me in the bag since it is much more practical and compact than the “official Sony”.

Anyway, it's a great buy.

If my review was helpful to you, feel free to say so.;)

I never knew K&F Concept made batteries. I’ve only ever used their filters and they were of great quality. So it’s good to see that they carried that care for quality into these batteries.

You get two NP-FW50 batteries a dual charger and a usb-c cable. You have to supply your own power adapter. The charger is not the best but it gets the job done correctly and safely. The charger gives you two usb options to charge with (usb-c & micro usb). The flexibility of the charging station allows you to charge on the go via a car charger or power power bank, keeping your batteries topped off while you work.

These FW50 batteries are on par with most good FW50 batteries I have tested from third parties. They hold up fairly well during activity and are a great replacement to any aging battery, even if they are the original Sony batteries.

This review is for the Sony NP-FW50 version

I tested these for a couple weeks with several charge cycles. I have also owned various other brands of aftermarket chargers and batteries. Having had good luck with K&F camera to lens adapters, I was looking forward to try their batteries.

Packaging:
Good quality shipping box. Includes a USB type A to USB Micro cable. Does not include a USB-C cable just a USB-A to USB Micro.

Charging:
Batteries arrived charged to about 65 percent according to what my Sony A7 was reporting and they do fully charge to 100%, but this can take quite a while, perhaps longer than the 2.5 hrs claimed. The LED goes from Red to Green on full charge which is nice and intuitive unlike on/off or blinking LEDs that other companies employ.

Battery
The tolerances on these are excellent. They fit several of my Sony camera bodies just as well as the factory batteries, not loose nor tight. They also fit the Sony OEM charges quite well. Battery power is better than other aftermarket batteries, but I don't think they are a good as the Sony factory units, but then again you get two K&F batteries for the price of one Sony branded battery.

My only gripe is that on the first couple uses, the batteries were a rather tighter fit on the charger than what I expected, but they do seem to go in easier after several uses and after about a month it's fine.

Overall I would say these are high quality replacement batteries and better than most competitors. The high tolerances of the batteries make a big difference as fitment can be just as important as battery life.

Batteries came half-charhed, so I have used charger overnight to give them 100% charge. I then left both batteries for another few days before I have tested them with my Sony camera. Both batteries shown 100% charge.
One of my previous sets of NP-FW non-Sony batteries had a habbit to slowly discharge about 1% per day of not being used and being out of camera, while another set died completely within a year of use. This one seems to hold the charge well for now. If I will see any problems, will update here.

As mentioned in the title of my review, the charger conveniently could be connected via typical usb, as well as newer format - usb C. The lights indicate correctly if battery is charged or not and accepts other brands of NP-FW50 batteries.

Overall, very decent quality and no issues so far.

They hold their charge for a long time, good batteries

K&F is quickly becoming one of my favorite off brands for photography. Every product I've gotten from them has impressed me in some way or another. These batteries are no different.
The batteries themselves fit perfectly and worked the first time reporting their battery percentage. The casing is nice - a touch more texture than my sony batteries but it's a good feeling battery.
The charging cradle is where I'm most impressed though. While it comes with a micro USB cable, there's also a spot to use a USB C cable to charge the batteries through the cradle. Anything that can reduce the number of cables I have to bring with me is a win in my book. And the charging cradle helpfully has the red and green LED indicator to show when batteries are charging versus full. I much prefer that to the LED on/off style since I can't ever remember which means charging and which means full.

Overall, a solid battery replacement set for anyone still using a sony camera with W batteries.

Great battery life and charges fast