Work great as a cheaper alternative to the Sony branded batteries! No issues within camera and seem to compare well with Sony batteries in terms of power and life. Charger is a bit slow but other than that, excellent bang for your buck with these alternative branded batteries!

Good value battery and charger kit. The batteries perform as well as the OEM ones do. The charger charges the batteries well and features an indicator as to whether the batteries are fully charged or not. Powered by provided USB cable, which is handy as it can be charged in any wall outlet, power bank, computer etc. Good value for money over the OEM batteries.

This K&F charger and battery set is essentially the exact same as the Neewer set I already own - except one key difference.

First off, the charger is small and compact, and takes either Micro USB or USB C input. Personally, I would have preferred USB C in and passthrough, but it’s not a huge issue.

The batteries are the differentiator between the K&F and Neewer sets. The former are slightly higher capacity, which was unexpected. I’ll have to get more use out of them in my Sony camera to establish whether such a small varience (16Wh vs 18 Wh) makes a real-world difference.

It’s a good set. I recommend it.

These batteries charge fast a last a while! I was happy to see that they didnt heat up while charging! I've had a few that has done that. The batteries lasted a long shoot that took 4hours! I was surprised! The batteries are compact and easy to travel with. They are good quality batteries.

K&F Concept NP-FZ100 2600mAh 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

Anyone familiar with K&F products know that you're getting a quality product for a fraction of the OEM price. These are substantially cheaper than the Sony equivalent without any loss in performance.

In the box you get 2x 2600mAh NP-FZ100 batteries, a twin slot mains charger and a USB power cable. All are well made and work really well too. Good value for money

The charger works well for two batteries, fitting both K&F and Sony originals. Build quality is decent, and the higher-capacity batteries (2600mAh vs Sony's 2280mAh) perform comparably to OEM, avoiding warning messages after firmware updates. Value is a key strength, offering two batteries and a charger for the price of one Sony battery.
Although not as fast for charging as other aftermarket chargers ive tried, but still quite fast. Charge time is acceptable via USB-C or Micro USB, completing a charge in a decent timeframe. Battery longevity appears good, with reports of them holding charge well over extended use. This is a worthwhile, budget-friendly backup power solution.

I've consistently found K&F Concept accessories to be reliable, and this dual battery charger kit maintains that standard. The kit includes two NP-FZ100 equivalent lithium-ion batteries, fully compatible with Sony Alpha series cameras, along with a USB Type-A to Type-C charging cable for flexible power input. The charger supports parallel charging with independent monitoring, aided by a clear LED display that tracks each battery's charge status in real time. In testing, both batteries were charged from zero to full in approximately 3 hours, delivering efficient performance suitable for on-the-go workflows. The entire set arrived well-packaged with a neat, professional presentation.

The K&F Concept NP-FZ100 battery and charger set arrived neatly packed in a printed cardboard box bearing the K&F branding.

In the box you get two 2600mAh NP-FZ100 batteries, a twin slot mains charger and a USB power cable.

The batteries will fit almost all models in the Sony A&/A6 ranges and are well finished with no rough edges or moulding flash.

The mains charger is also well constructed and features a LED indicator for information on the state of charge.

The batteries were a good fit in my A7 and showed no signs of slop or of being too tight, with battery life being comparable to the original Sony batteries.

A great value set of spare/replacement batteries for the Sony A7/A6 owner.

They look and feel the same as Sony batteries - and behave like them too. But these are half the price, double the battery count in a pack, plus a dual charging dock.

I wish I could test the claim of 2600mAh as the first-party Sony batteries are 2280mAh - that’s an increase of 320mAh capacity. K&F are a pretty trustworthy company, so I will put this down to battery technology becoming more optimised as it matures.

The charging base is pretty generic and looks exactly the same as the other plastic battery charging trays I have, with a USB-C and USB Mini input, so if there’s a chance you forgot one cable type you’ll hopefully have the other. As with many other charging devices, you will require your own power adapter to connect it to an outlet, but the odds are you’re drowning in cables already from your other devices. Just make sure the push-through is high enough to benefit from the quicker charging times.

You also have small snap-on plastic trays with the batteries to stop the contacts short-circuiting by touching other metallic objects - a first, given all the batteries I’ve bought, but they are a bit loose and rattly, for all their handiness.

There’s nothing in the instructions mentioning that charging two batteries simultaneously will split the charge current and take a little longer overall. This happens with other generic chargers, and will happen with this one also.

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!