If you provide this thing with enough power (40W+), it will charge all four batteries simultaneously and rather quickly, which is awesome. I tested it with 4 NP-FZ100 batteries, a 50W USB-C charger, and it worked great. The charger itself is nice, premium feeling with rubber feet - very well done. If you put batteries in it and press the button, it will tell you the charge state of the batteries, even when unpowered. It has USB-C in and out and can work as a power bank, which works well, althought it only charges devices at 15W on the output. It has some SD card slots as well, and is stable. I wish the lid was speing loaded so that when you press the hinge button it poppe open instead of having to hold the button and open the lid, and I would exactly call this portable, it's more a desktop style thing, but if you have the space in your bag, you can use it to hold and transport the batteries. I really like it.

I have so many battery chargers between all my photography cameras, action cameras, flashlights and Ni-MH batteries that after a while they all seem to have a very similar generic and basic quality and feel. Granted, most of these chargers were provided with the cameras or flashlights so they felt cheap.

This K&F Concept 4-Slot Battery was a pleasant surprise for me upon opening the package and feeling it in my hands. My first impression was “Wow!” The fit, finish, and design felt like the price was justified.

It charges 4 batteries! But the best feature, especially for my needs, is that this charger doubles as a power-bank. Rarely do I use up all four batteries on my trips, but I bring them anyway in case I need them. So most of the time two batteries are dead weight in my backpack. I also bring a powerbank for my smartphone and that is also extra weight. Now with this charger I can leave the dedicated powerbank at home and no have to worry about my phone running low.

Lastly, this is nit-picky but I'd love it if the battery status indication reflects the actual positions of the batteries

I continue to use my older Sony cameras that take the NP-FZ100 batteries and recently had to get some more of them. So when I saw this – and that it’s K&F Concept, a company with an excellent reputation for photography-related products – I ordered it. It was delivered only a few days later in excellent packaging and brand-new perfect condition. This is an amazing and well-built - of the usual tough/sturdy ABS-like plastic - 4-battery charger. It has all the over-charging, overheating, over-voltage, over-current and other protections as well as bright indicator lights outside showing the charge status of each battery. It’s fast-charging too, so I use my 65W charger block with this to get the maximum benefit. It's recommended that at least a 40W black be used. Before I would very occasionally run out of fresh batteries with my previous two-battery charger. But now that should be a never event. Both my OEM and 3rd-party batteries fit and charge up well in this device. It could not be easier to use. What’s really great about this too is that it’s got USB-A and USB-C outputs so it’s literally made to function as a power bank to charge other devices in a pinch. Or, when this is plugged in, I don’t need another charging block for charging those other devices as pass-throughs. Plus it’s even got slots for keeping SD memory cards. Yes, it’s a bit bigger but not in comparison to my longer lenses, tripod and other gear when I travel with those. There are few other comparable products out there and the ones most similar are more expensive compared to this one’s $49.99 list as of this writing making this charger an exceedingly good value.

This is a great package. First off, it's a sequential charger which is very handy. My previous charger was a 3-battery multi-charger, but charged all 3 batteries at the same time. This significantly slowed down charging and meant if I needed a battery quickly, I had 3 partially-charged batteries instead of 1 fully charged one. The sequential charger will fully-charge the first battery before moving to the next, meaning you will have a fresh and full battery faster.

The case itself is well built, and I tested it with NP-FZ100 batteries for a Sony A7Riii. It's designed in a case-style, which makes it hand for travelling. I keep a bag with fully-charged batteries and as I deplete them, I move them to the case. It also has slots for media cards, though I rarely shoot enough to fill my cards it's nice to have a designated place for full ones if I'm on an extended trip in the future. It's a great value and well thought out, very functional charger.

I love this four-slot battery charging box. I shoot with Canon cameras and have always relied on bulkier Canon chargers, which meant needing multiple outlets all over my apartment whenever I had several batteries to charge. This little charger solves that problem. It’s compact and can hold four batteries at once, all charging simultaneously, which is a huge time saver.

It's super easy to use, the batteries just pop in the slot and start charging. The batteries charge quickly, and the built-in indicators show the charge level for each battery, which is super helpful. I also really like that there’s a side slot for storing two SD cards and two CF Express cards, so you can keep everything organized and safe. It feels sturdy and well made, and it comes with a USB C charging cable.

It’s compatible with my Canon batteries and has been a reliable addition to my gear. K&F Concept is a brand I trust for camera accessories, and this charger is another example of their quality. For the price, it’s a great value and an essential accessory for travel or busy shooting days.

It charges the NP-FZ100 batteries for my Sony A7iv camera perfectly. I have both Genuine Sony and aftermarket batteries, and they all fit and charge without any issues. It took me a moment to figure out that I have to turn all the pin ports towards the center of the device. It's great that this charger works with Canon LP-E6 batteries too.

This set comes with a USB C cable and the instructions recommended charging with a 40 watt charger to get the fast charging speed benefits of all four batteries at once. It works with a lower wattage power source too, but then it charges slower and doesn't charge all four batteries at the same time. I love that it has a power status indicator display for each battery, and holding slots for CF Express A, B and SD memory cards. It even has USB A and C out ports to power other devices.

It's built with quality materials and construction and feels very durable with a cover. It's a bit larger

This is another must have for photographers. Why? Because you can charge 4 batteries at one time. I had already ordered one of these previously by another seller. It was so awesome that I jumped at the opportunity to get another one. Now with two of these, I can charge 8 camera batteries at once. This expedites prep for an event or photo shoot. Looking at the previous charger I ordered and this one, I noticed they are identical except for the name on them. You can also use this charger to charge other items using the side ports where you have output for USB-a and USB-c. Photos included.

This is a well-designed battery charger. It can charge both Sony and Canon batteries, and it also has two USB outputs so you can charge other devices at the same time. The build quality feels strong, and the display is easy to read. It works well and is the right size to hold four batteries and some memory cards.

I’ve been relying on the original charger that came with my Sony FX3, but with four batteries it was always a hassle to charge them one at a time. This K&F 4‑slot charger completely solved that problem. Being able to charge four NP‑FZ100 batteries simultaneously saves me so much time and ensures I always have charged batteries on hand.

The electronic display on the front is a great feature - it shows the charge status and levels for each battery, so I always know exactly where things stand with each battery individually. On top of that, the charger includes two USB‑C outputs, which means I can also charge my phone or other USB‑C devices using the batteries inside so it’s more than just a camera accessory - it’s also a portable power bank.

I like that it’s compact so I can always keep it in my camera bag. I also appreciate the slots inside to store extra memory cards.

Highly recommend for anyone juggling multiple batteries and devices.

This battery charger is clean and well made.
Compatibility includes both Sony and Canon charging systems, namely the two NP-FZ100 and LP-E6 systems.
Up to four batteries can be charged at the same time, which works perfectly.
For each battery charging unit, there is an LED display that shows the specific charge status.
In real time: 25%, 50%, 75% and 100% charge status are displayed.
As soon as the respective battery is charged, the LEDs turn into a continuous green light.
For fast charging, the device provides a maximum of 40 W, with a charging time of approximately two and a half hours.
The price-performance ratio is quite acceptable.
I give it five stars here.