I ordered this product for two reasons.
1. I wanted additional batteries, of course
2. I wanted an external charger.

The batteries have exactly the same power and capacity as the original battery. I have felt the same way so far and can't tell so far that these batteries run out faster.

The charger is extremely light (plasitk) and really fits quickly in your pocket, it fits in the photo bag or backpack. It has a display showing the charging status of the batteries (1-4/5 bars). You can connect the charger anywhere, it has 2 interfaces, either via a micro USB cable (included) or with a USB-C cable (not included). This is convenient, of course, since one of them usually has everyone somewhere, and even in the car above the cigarettes lighter with charger, they can be charged without any problems.

The original battery charges the same as K&F Concept's, so everything I assumed has been fulfilled.

The price is of course another extra point, considering that a single Sony battery cost around €65 and you get 2 here including a charger.

This battery pack is great, it save you quite a lot of money and totally safe for my A7S iii. It can be quickly charged up in 1-2 hours so you will never run out of supply although the battery did last me a whole week if only taking a picture with video on occasions. Say no more to doubt

Very good charger, it's excellent and fast charging I recommend it

Bought this for my alpha 7iv, have used the batteries without problem. Charges from empty to full takes around 2.5hr. Great to be able to charge two batteries at the same time. Batteries are slightly less long lasting than the Sony original but I would say they are 70%. For the price, I can't complaint.

This NP-FZ100 battery charger from K&F CONCEPT is a real miracle of performance. It starts with the fact that it works all over the world, regardless of the current supply. Because it charges via USB. So it can be powered by any USB power supply, from a laptop, a desktop computer, on the go via a car charger, a power bank and whatever else I have to hand. It has never let me down. The charger has two alternative connections: Micro-USB (that's the narrow, angled one) and Type-C, so no matter which cable I have to hand, you'll never be left empty-handed with this thing. But you will be left with a rather meaningless progress indicator. If a charger for AA batteries that costs just 20 euros can offer a precise display of the amps and charge level in real time, I don't see why you have to settle for a red/green light for the batteries. For the price, it should be OK. The manufacturer promises every conceivable protection - but no protection against moisture, which I actually find a useful feature (but probably not for the low price). The charger can charge either one or two batteries at the same time. My version (NP-FZ100 camera battery charger) comes with two powerful batteries (81.99 EUR). I use these camera batteries with my Sony Alpha 7 III (A7RIII). They also work with the Sony A9, A7III, A7RIV, Alpha 9S, A9S, Sony A7R3 and Sony A7R4 digital cameras. This offers a certain degree of investment security. If you change your Sony camera and choose a compatible model, you can continue to use the charger and batteries. I really like that. Since I often photograph time-critical events, every minute counts for me. Sometimes I have to slightly enhance the photos to meet the customer's workflow requirements (a certain resolution, a certain image format, conversion to an ICC profile, blurring unwanted details, and the like). Often this can even be done in batch processing. I'm currently using my ASUS Zenbook Pro Duo laptop with Adobe Creative Cloud under Windows 11, because the built-in NVIDIA GeForce RTX 3060 graphics card has enough power for fast batch image editing - even under extreme time pressure. And with this charger, I don't even need a power outlet (and certainly not a second one!); I can simply plug the charger into the ZenBook and that way I always have freshly charged camera batteries with me. You just have to get a powerful cable yourself. I received this set from Amazon as part of a product test. This has no influence on the rating. I am judging the test product as if I had paid for it out of my own pocket at the current price of just under 82 euros (81.99 euros, to be exact).

Both batteries are fully compatible with my A6600. Incidentally, all other batteries from third-party manufacturers (Blumax etc.) are also compatible. Apparently the problem with the incorrect battery display etc. only affects the 7 series of Sony cameras. In my opinion, the charger is not that great. I will therefore not use it, but only connected it for testing. Firstly, there is the extremely long charging time. I have a four-way charger here that can charge in about half the time. Secondly, the fact that there is actually no display is annoying. Either a red LED (charging) or a green LED (charged). That is not enough for me, especially with camera batteries. I need a relatively precise capacity display. So I want to know whether the battery still has 40, 70 or 80% power left. You can forget about that here. In this case, the only option would be to put all the batteries into the camera individually and read the values there. Annoying. Hence 4 stars.

Awesome product, Charges fast, really light weight, was a blessing received it the next day in time for my shoot and lasts if not as long pretty close to the original Sony battery. Overall really really happy

Two batteries for this price seems to me a great option. I have used them and I wouldn't know if there is any difference from the original. It also includes the charger, which is very useful to be able to recharge two batteries at once. Very happy with the purchase. Delivery was made on the indicated date and without any incident.

I always purchase battery chargers for my cameras and I often will pay the premium for a OEM product , but this unit was worth the risk, it charges fairly fast and the batteries are recognized by the camera.

Worth getting. Lasts just as long if not longer than my new Sony oem batteries. Charger is nice, has a port for usb-C and micro b, compact as well, super convenient. Don’t worry just buy them. K&F Concept is a great knockoff company and they make good products. I’ve used them for the past 3 years for various things and they have decent customer support if something is just not right.