K&F usually has good products and these are no exception. They behave with a similar capacity to the OEM Sony batteries. The charger is USB-C so its easy to charge. They will also charge inside my camera body. I think they're a good value since Sony batteries are so overpriced.

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.

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 :-)

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.

Full Disclosure: This product was received for free as part of the Vine Program.

This K&F Concept battery and charger set is a practical and high-value accessory for any photographer using Sony cameras that take the NP-FZ100 battery. The core of this kit is the compact dual-slot charger and the two included high-capacity 2600mAh batteries.

The charger itself is the standout feature. It efficiently charges two batteries simultaneously, which is a significant time-saver and ensures you always have a spare ready for a long shoot. What makes it exceptionally versatile is the inclusion of both USB-C and Micro-USB input ports. This is a fantastic design choice, as it means I can charge the batteries with any modern phone charger, power bank, or laptop cable I already have, reducing the number of specific cables I need to carry.

The two included batteries have a 2600mAh capacity, which is slightly higher than the standard OEM batteries, offering the potential for longer shooting sessions.

I use K&F Concept photo accessories all the time. As a Sony owner, I am elated that I can now charge 2 batteries at once and this deal has 2 batteries included with the dual charger! WOW!!! Need I say more? This is such a time saver. Make sure you are using a powerful fast charge charger plug and a cord rated for it. Most of my batteries that were tested had a 50% charge to start. It did take a couple hours to bring them to full charge. I guesstimate this charge will take at least 4+ hrs on a depleted battery. I love the fact that it shows the amount of charge remaining, no guessing or having to load every battery in the camera to see , that is unless I want the exact percentage. It did not get too warm. Great price for the 2 K&F Concept batteries and the charger!