Great product for the price and function.

No issues so far paired with a X-T4. Charges fairly fast via USB-C and it exceeded my expectations in terms of battery life. Wasn't crazy about the blue design at first, but now I actually love it. Great alternative to OEM.

I have several spare batteries for my camera and this one is a welcome addition. The feature that really stood out is the USB-C port on it. You can charge it quickly this way without needing to plug in the camera or put this into a dedicated charger. Just pull out an available USB-C wire and start charging.

K&F CONCEPT never fails to impress me. I never really thought about this for camera batteries, but they built a USB C port right into the side of the battery itself. Whenever I run out of charged camera batteries on the road, I don’t always have access to an AC outlet. But I always have a USB port in my car or a portable power bank to use. I’ve seen designs like this for other things like flashlights, but never for a camera battery. To add to the goodness, this battery has a higher MAH rating than the Fuji OEM one. Well done K&F CONCEPT!

I ordered this K&F CONCEPT NP-W235 2400mAh Battery to use in my Fuji GFX100s.

The GFX100s is a great camera, but battery life is not so great. Instead of using a larger battery, Fuji chose to use the smaller battery from their Fuji-X cameras to keep the 100s as small as possible. While I appreciate the form factor of the 100s, I'm not a fan of how many batteries it goes through during a heavy day of shooting. And because I often carry more than one camera, that means carrying a charger for each battery type.

Kudos to K&F CONCEPT for eliminating the need for a separate battery charger. This battery has a USB-C input that allows you to charge the battery from any source of USB power. I tested the battery life and I did not really see any difference between the K&F CONCEPT and my OEM Fuji battery. I should note that the OEM battery is about a year old, so it has probably degraded somewhat whereas the K&F CONCEPT is new. As for recharge time, it took under 3 hours to go from a dead to fully charged.

I did try to recharge the K&F CONCEPT with the OEM Fuji charger and got no errors, so if you want to use a standard charger, you can. Personally, I'll be replacing all of my W-235 batteries with these as they age and lose the ability to hold a decent charge.

After shooting over 100 shots the battery is about 3/4 full. Seems to be working as well as the original Fuji battery.

This particular battery model boasts a highly practical feature - a USB-C charging port that is built into its design. It should also be noted that this battery model has a marginally higher capacity than the original OEM battery. Great value for the money. I will highly recommend it.

This is a great idea, building the recharging component directly inside the battery housing so that you no longer have to carry a separate battery charger. All you do is connect the USB C cable to a power source and connect the other end to the battery itself (which has a USB C port built into the body). The supplied cable is short, but adequate. The dimensions and sizing of the battery are exactly the same as the original OEM battery, and the battery slides in and out and clicks into place in the camera just like the original. A nice touch is that it comes with a protective cap for when it is not in use (even the original Fuji batteries do not!). No concerns about battery life compared to the OEM. About half the price of the original battery. And, as pointed out by another reviewer, you can also charge the battery with a traditional charger if desired. Feels like a high quality build. Highly recommended.

The biggest advantage of this battery is that it can be charged directly through a USB-C charging source. No special, proprietary charging device is needed. You don't need to use the camera to charge it either. With ubiquitous of USB-C, it almost guarantees you will be able to charge it when needed. This is especially helpful in travel. By the way, you can still charge it using Fujifilm XS-20 or XT-4 and so on, if you want to. Fujifilm's W235 has 2200mAh capacity. This one has 2400mAh, a bit more juice. Overall, this one is better than the OEM one, I think.

This battery is like other third party batteries for the Fujifilm X series cameras, but with a nice extra feature. That feature is the USB-C port on the battery to allow charging it from a USB charger.

You can also charge the battery in the standard way by putting it into a charger.

I like the USB-C charger approach because it provides a second way of charging the battery. When I travel, I take a battery charger with me. But if something happened and I lost the charger, or it failed, I'd be in a heck of a mess because I'd quickly run out of battery power for my camera. With the USB-C charging port, I can still charge the batteries.

The battery claims a slightly greater capacity than the original Fujifilm battery - 2400mAh compared to 2200 mAh - and works in my X-H2 camera fine.

Recommended to anyone traveling with a Fujifilm camera.