K&F CONCEPT NP-FW50 dual slot fast charger, Micro USB and Type-C dual interface compatible battery Sony A6000, A6500, A6300, A6400, A7, A7II, A7RII, A7SII, A7S, A7S2, A7R, A7R2, A55, A5100, A5000, A3000, A55,RX10, NEX-3/5/7

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.

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.

Great battery life and charges fast

Works amazing. Fits my Sony A7iii with no issues. They work just like the original Sony batteries. Love these and love that they come with their own charging station. I highly recommend these to anyone.

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.

Totally fine, no major complaints off the bat with these. The charger isn't the best design- it only tells you if it's charging or charged, without indication of exactly how charged the batteries are.

Time will tell if the actual batteries hold up- it's been about a month and they haven't gone bad, so at least I didn't get any particularly terrible ones. I had another set from a different brand where one battery took 6 months before it became unusable, and the other battery took a year. Meanwhile my original Sony branded battery is 2 years strong and shows no strange behavior, just *maybe* slightly lower capacity than my newer Sony branded batteries. It seems to be a trend that these non OEM batteries just aren't made with high quality cells, so hopefully K&F Concept's batteries will be a change from that. I've liked K&F's other products, so hopefully these won't be an exception.

I keep all my batteries labeled (A, B, C...) including their first use date, and I evenly cycle between all my batteries (after A is done, I move to B, then C, etc... until looping back to A). That way, none of my batteries get used harder and more often than the others. In turn, that allows me to catch a bad battery early, and know that it wasn't because I used it far more than the others. Hopefully I'll remember to update this when these batteries finally go kaput (or at least start acting funny).

I got this and a battery grip for my Sony a6000. Went on vacation and only shot photos and the batters lasted all day. It was 90degrees outside and no issues.

Good recharging unit fast and reliable, easy to use.

This is excellent for professionals and hobbyist photographer like me. Charges battery all at once . Does the job perfectly. It fits into the pocket even if the batteries are docked. Easy to carry around. Value for money. 200%

As good as the original and charges from the car!
Perfect