K&F Concept NP-FW50 Battery with Type-C Fast Charging for Sony ZV-E10, Alpha 7, A7, A7II, A7RII, A7SII, A7S, A7S2, A7R, A7R2, A5000,A6000, A6500, A6300, NEX-3, NEX-5(1 battery)

Although this is the first battery I've used from them, K&F Concept is a well-respected brand for camera accessories in general, and these batteries have the clever twist that the Lithium Ion charge circuitry is built into the battery, so no charger is needed. Despite that, THESE BATTERIES HAVE A VERY COMPETITIVE PRICE -- less for these two than I paid for my first one with a built-in charger. There is a simple LED that lights red when charging and turns green when charged. The battery comes with a charging cable, but no USB power supply... which isn't a big deal; the cable is a little unusual in that the USB C end clips into the battery a bit more authoritatively rather than just smoothly sliding in.

It used to be that 3rd-party smart batteries often were recognized as "fakes" by cameras which would then refuse to operate with them, and some camera models and firmware revisions are pickier than others. Over the years, I've amassed quite a collection of NP-FW50 batteries and clones, including several rejected by my newer cameras or even by my original NEX-5 after I updated the firmware.

Incidentally, the main reason I'm still buying more NP-FW50 is that I have a fleet of Sony cameras (NEX-5, NEX-7, two A6000, A6500, A7, A7II, and two A7RII) that take this battery and about half of the batteries I have eventually (after multiple years of use) started to swell a little, which is a major danger sign for Lithium Ion batteries. If your batteries are becoming a tight fit into your camera, they are swelling too and you should properly dispose of them.

Anyway, I've tried using this battery in my Sony A7RII, which is one of the latest and presumably pickiest models taking this battery, and, happily, it seems to work identically to the Sony-branded original batteries. It's too early to say if this battery will hold charge as well as Sonys over time, but so far, so good. The battery fits the Sony cameras perfectly and has a distinctive two-color case, white on one side and gray on the other, which makes it easy to avoid confusing it with the ones that need a separate charger.

Overall, I think the concept of not needing an external charger is really good and worthy of a 5/5, although the benefit is reduced slightly by the fact that you still need to carry a USB cable to charge it. It does come with a charging cable, but it would be better if the battery itself had a pull-out USB head so you could just plug it directly into a USB power supply without the need for a cable. Unlike a very similar battery, there isn't much of a price premium for these over other non-Sony FW50 batteries that don't have a built-in charger. Thus, I very strongly recommend these...

I’ve become a fan of K&F; they have proven themselves to be a serious player in the photographic and videographic markets with professional quality accessories across a broad spectrum of the marketplace.

The K&F Concept NP-FW50 battery is a professional quality replacement for Sony’s OEM NP-FW50 battery. And it is an awesome replacement!

The Sony cameras that use the NP-FW50 battery, including the A7rII that I own, are infamous for their voracious use of battery energy. And although these K&F Concept replacement NP-FW50, rated at 1100 mAH while the Sony OEMs are rated at 1020, only have about 8% more capacity, they have a shorter charging time, a number of convenient charging options, and a longer life between charges. With its USB-C charging input, it can be charged almost anywhere and with almost any charger in use for today’s current devices that has a USB output; that includes the original Sony plugin wall charger, car chargers, power banks, your phones charger, etc. And the cost of the K&F Concept 2-pack of NP-FW50 batteries is about a third less than a single Sony OEM battery.

Included with the batteries is a USB-A to USB-C charging cable for each, with a convenient cable wrap, a nice touch. There is a charging status light on each battery that is red while charging and turns green when the battery is fully charged. In one of the batteries that I received, rather than turning green when it is fully charged, the light just goes out. Not a big deal to me since the battery showed as fully charged in the camera.

Rather than a replacement battery for the Sony OEM NP-FW50, the K&F Concept Batteries are an upgrade.

I am loving this battery! Apart from having spare batteries at hand to supplement the original one (that came with my Sony ZV-E10 which doesn't last too long), I love the ability to charge these outside the camera using USB C. I've charged it using a wall charger, a car charger and a power back in different scenarios - and it is a life (and time) saver!!

I also like the LED in each battery that is red while charging, and turns green when the battery is charged.

The battery fits my Sony camera perfectly, and the camera didn't show any warning about the battery not being original, etc.

TL;DR - you are paying a premium of both price and battery capacity but gaining the ultimate travel convenience of not having to bring a separate charger.

CONs:
- More expensive than other aftermarket batteries. Of course still way cheaper than Sony OEM batteries.
- slightly less battery capacity than other batteries. This makes sense since the volume of the charging components take up space that could have otherwise been battery.

PROs:
- Ultimate travel convenience of being able to charge up your batteries with the same cable that you charge your phone with.
- Comes with USB-C charging cable.

What more can you say. My old Sony Nex works with at as well as my trusty A6000. Only time will tell of its longevity.

Since FW50 batteries are so small, I didn’t expect to find a FW50 battery with USB-C charging capabilities.

Overall the battery is about a half-milliliter wider than the official Sony FW50 but it still fits inside the camera well. I tested with Sony ZV-E10 and the battery fit smoothly and performed flawlessly.

Due to its ever so slightly wider shape, I found this battery doesn't fit some third party battery chargers.

The USB-C charging is of course appreciated, as this means I can more easily charge batteries on the go and not have to worry about a separate battery charger.

Overall it’s another winner product from K&F concept.

I have owned many batteries for my Sony A7 and this aftermarket battery with built in USB-C is a game changer. In the past I would have to just bring hands full of batteries with me. The next progression was a USB powered charger. Now with the built in USB port, that takes it to the next level. I almost always have a battery pack with me now between the phones, tablets, etc. that I carry. So now that the port is built in, I can literally take out a low batt and plug the USB cable into the batt and go.

Battery life so far is good, but longevity will be the ultimate indicator for whether this is a good value or not. For now everything works as it should so it gets 5 stars.

It’s cool to be able to hook these up to a cable in a pinch. They last a few minutes longer than the stock battery.

The problem with my zv e10 is that these batteries are so small you need to have a bunch on hand if you are out shooting video,that means having to carry around a charger as well. These are super convenient to be able to charge directly from any usb c charger cord like the one in my car all the time. This is a great invention!

I thought it would be a great idea to have the charger built into the battery.

So far so good. They charge fast enough. I haven't tested them for speed in a charger ro see what's faster. They fit in my sony a6000 camera without issue and work fine.

The built in charger make easy to carry a pocket charge and plug that into my battery while on the go. But I still think a regular charger is te way to go.

I think these are the first batteries I've used where I truly feel that they're better than the original batteries. My Sony A7RII is notorious for having poor battery life so I always use a vertical grip with mine. It may be due to age but my Sony batteries never lasted very long and typically, by the time I take 200 shots, I'm already on my 2nd battery.

I've only had these batteries for short while but I was surprised to find that I was still on the first battery after 200 or so shots. I compared the weight and the ratings for these batteries and these weigh 5g more than the Sony ones (probably related to larger cells and usb-c charging mechanism) and are rated for 1100 mah vs 1020 mah. And with the convenience of charging these in multiple ways, whether it's via charger or usb-c, this is a no brainer purchase. So far, these have been longer lasting and better than the original. Very impressive!!