Works well and it’s a decent price! Compact and durable. Works well with native batteries and seems to hold a charge just fine. They’re compatible with me a7 iii

I recently picked up this K&F Concept NP-FZ100 Battery and Charger Set for my Sony A6700, A7 III, and A7R III, and it’s been a game changer for my photoshoots. The set includes two 2600mAh batterie which are slightly higher capacity than the OEM Sony batteries and a compact dual lot charger with both USB-C and Micro-USB inputs. This versatility means I can charge via a wall adapter, laptop, or even a power bank when traveling.

The batteries fit perfectly in all three cameras, registering full compatibility with no warning messages, and they perform reliably, holding a full charge for extended shooting sessions. The charger is straightforward and displays each battery’s charge independently, which is reassuring when planning long photo or video shoots. The build quality feels solid, and the protective plastic covers for each battery are a thoughtful touch for safe transport.

On the downside, the charger isn’t fast. Charging two completely drained batteries takes several hours, so it’s best to charge overnight rather than expecting a quick top up.

Overall, this set delivers high-capacity, reliable batteries and a convenient charger at a fraction of the OEM cost. So it's an excellent value for any Sony photographer.

Thankful to say this will be a boring review. Everything works as expected, I use these in an FX30 Sony and I find the battery quality to be very reasonable and hold a charge as well as an OEM standard battery. Reasonable charger, and two batteries for a fair price. All works as you would hope so all positive 5/5 application for me.

I picked these up to use with my ZVE10ii, and they do not disappoint! They are larger than the OE battery that came with my camera, and work just as well while lasting longer. They charge quickly, and the dual charger is great. The design is identical to the OE ones and they fit perfectly in my camera body. For the price, you cannot go wrong with this! Great value! I would highly recommend :-)

Perfect kit for me as my FX30 battery could only be charged when the camera was plugged in.

One of my biggest dislikes about my FX30 was that it only came with 1 battery and had no exterior charging block to charge the battery outside of the camera. It is annoying to have to have the camera body be on my desk taking up a decent amount of space just to charge a battery that would normally come with a charging block. This one from K&F comes with 2 larger mAh batteries and an external block I can setup to charge my batteries outside of the cameras body.

The batteries have a slight bit more power storage than my OE Sony provided battery which is great as batteries tend to go through juice quite fast when shooting at higher resolutions. The fact that it also comes with 2 batteries makes sure that I can have extras charged and ready to go as I shoot footage throughout my sessions.

The batteries charge fairly quickly and fit into my FX30 perfectly with no fitment issues. I would highly recommend this battery kit to those that are looking for more batteries or for those who can only charge their batteries through the cameras body.

I was initially hesitant to use third-party batteries, but these K&F Concept batteries have put my mind at ease. They come with multiple safety features – overcharge, overheat, overcurrent, and short-circuit protection – which is incredibly important when dealing with lithium-ion batteries. The dual charger is well-designed and displays the charging status clearly. I’ve used them in my A6700 without any issues, and they seem to perform just as well as my original OEM battery. A great option for those prioritizing safety and reliability. These are a great value for the money. They're as easy to use as the OEM batteries, the charger dock is ultra portable as well. The battery life so far is just as good as OEM batteries.

K & F always makes fantastic products and this battery charging combo is no different. The batteries are always quality and recognized by Sony cameras, which seems to be a problem with other batteries they last just as long as the factory batteries, if not a little bit longer overall you can’t beat K & F quality

Another high quality item from K&F. The items came packaged well. I plugged the batteries into the charger and they were about 2/3 full out of the box. They charged at about the same rate as my Sony batteries. They went into my a6700 perfectly with no bricking or warnings. Time will tell how well they last. I will update if there are any issues.

Summary:
These are great replacement/backup batteries from a known reputable brand. An original SINGLE Sony battery will cost you around $87. With K&F, you're getting 2 batteries and a way to charge both of them at the same time for less than that. The only thing to complain about is that the charging speed is pretty slow.

Pros:
K&F is a known and reputable brand in photography. Although there are definitely cheaper batteries from Chinese vendors, you really don't want to risk gear worth thousands of dollars on unbranded unknown dangerous things like batteries. Just look at any reviews of those cheap batteries and you'll see people complaining about swelling, loss of battery life, even some expanding and getting stuck inside the camera body.

You can connect with USB C or Micro USB rather than a proprietary connector. This allows you to use a portable battery bank to charge the batteries if you're out on the go rather than needing to be home and near a wall outlet.

Cons:
Although convenient to charge two batteries at once, the charger is really slow. It took around 5 hours to charge both batteries to full. The charger is definitely made for convenience rather than speed. You can just drop your batteries in overnight and they'll be ready the next day. I shoot relatively infrequently so I don't need to charge too often and so it doesn't bother me as much as it might a professional or dedicated hobbyist. Don't expect to charge them and use them the same day if they're at 0.

I am a long time K&F Concept customer and have spent hundreds of dollars on their products. Why? because I have found them to be of high quality and a good value for the money. This is the first time I recall being less than 100% satisfied with one of their products.

Before testing, I wanted to ensure the batteries were fully charged, so I popped them into the included battery charger and hooked it up to a fancy PD 3.0 USB charger. I came back after some time and was surprised to see the indicator meters on the battery charger were still flashing (and that they were desynchronized), as pretty much every camera battery I’ve ever gotten has arrived with close to full power. Thinking the issue might be an incompatibility with the PD charger (some “dumb” devices just don’t like it), I switched to a bog-standard USB charger. Came back after a bit and the indicators were still flashing. Came back after several hours and one indicator had gone out (which I assume meant “fully charged”), the other was still flashing.

Wondering if the issue lay with the batteries builtin charging protection circuit or the battery charger, I popped the batteries in another brand’s charger. After a few seconds, the indicator’s stabilized—one battery showing fully charged, the other as still charging. I then tried both batteries in my camera, which reported a 100% charge level on both of them. From evidence, I must conclude that one of the battery’s charging protection circuit is defective and I am concerned that, given how unusually long it took for the other battery to report “fully charged,” that it may have issues too.

The batteries are correctly sized: they fit in the camera without any issue. As they seem to be functioning just fine (apart from the afore mentioned charging oddities, which I think warrants at the very least a 1 star deduction), I’m going to give them a decent rating. I’ll update this review if any other issues arise.

[Disclosure: I received this product for “free”—in quotes because the IRS considers the item’s retail value as taxable income for federal income tax purposes. This review is my personally written—not AI generated—honest opinion, and is uncensored by the seller.]