K&F Concept 2600mAh NP-FZ100 Battery and Charger Set, Compatible with A7iii Battery A7 III, A7iv, FX3, FX30, A6600, A7C, A6700, A7RIV, A7Siii, ZV-E1, ZV-E10ii, Alpha 9 II, A9S Cameras

This battery and charger kit is a solid choice for anyone with a compatible camera. I bought it for my A7iii, and I'm really impressed. Not only do they work just as well as the OEM batteries that came with the camera, but they also fit perfectly in the camera body, so you don't have to worry about a drop in performance or a loose connection.

​The batteries themselves have a 2600mAh high capacity, which gives you plenty of shooting time. The best part is the dual-slot charger, which lets you power up both batteries at the same time. The whole setup is small enough to fit right in my small camera case, which is a huge plus for traveling. The LCD screen is also super handy because you can see exactly how much charge each battery has in real-time. I even noticed that the charger works just as well with my original OEM batteries, charging them at the same rate as the new ones.

​Speaking of charging, I noticed that the charging speed really depends on the power adapter you use. I have a fast-charging USB-C adapter for my laptop, and it charged both batteries to full in no time. Another thing I really like is how you can charge the batteries with a regular Type-C or Micro-USB cable. That means I can use my phone charger, a car charger, or even a power bank to charge my camera batteries on the go, which is a huge plus.

​Overall, this kit is definitely worth the money. Considering that a single OEM battery costs almost as much as this entire package, it's a no-brainer. If you need extra batteries for your camera, this kit is the way to go. It's fully compatible with a ton of models and gets the job done without any fuss.

I'm a sucker for more batteries, and I have many K&F products already. I tend to trust them.
The batteries were in great shape upon arrival, and I charged both batteries right away with the charger.
Charged great and both batteries have been drained and recharged several times already. Everything is working perfectly.
Nothing fancy going on here, and while the batteries do not have their own charging port, as seems to be the latest thing now, it's also one more place dirt and grime can build up. I do like the convenience of included ports, I don't need to have them. I'd say half of my batteries have ports and half do not. It rarely makes a difference in the end.

It's a pretty good deal for the coin being asked. Two batteries, a charging wire and charger...all one needs to get going.

Recommended.

These are very nice, and higher capacity than the OEM batteries which is always nice. I have several K&F items in my bag, so I feel comfortable using batteries from them.
I got them all charged up, and the display on the charger is really nice, showing an indication of the charge. I had a shoot today and wanted to give them a test run. I shot for about an hour and a total of just under 500 photographs. Starting at 100% and ending at 72%.
One thing to note, I did not get the battery warning saying it might not function properly one either my a7rv or my fx30. I'm sure that will change with the next firmware update though.
Overall super happy with these batteries.

The K&F Concept NP-FZ100 2600mAh Battery and Charger Set is a must have for anyone with a Sony camera that uses the NP-FZ100 Battery. I recently got the A6700 and was disappoint to find out that it didn't come with a battery charger and you could only charge it while it was in the camera. So I went looking for NP-FZ100 battery charger and for less than the price of an OEM battery, I found this K&F battery and charger set. I'm very please to say that is exactly what I wanted along with 2x extra batteries and a charging dock. This dock also can charge the battery that came with the camera. So if you shoot with Sony Cameras, I highly recommend picking up this battery and charger set.

This is a good battery kit to keep as a spare for your Sony camera. Batteries charge up and work well in the camera. Battery life is on par with original batteries (so far). Nice compact charger. A nice set here.

The batteries work in an A7RV without the usual "must press Confirm to use" warning from the camera when it detects a non-Sony battery. Two batteries plugged into a USB-C port in a multiport 200W charger went from 2 bars (assumed to mean 50%) to 4 bars (100%) in about 4 hours. So it's not as speedy cycle time as a more powerful charger would provide but is good enough. Haven't tested the extra capacity/amperage they afford.

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.

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.

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 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.