Got this K&F concept battery to use on my Canon R6 rig with the Smallrig tiltable Vmount bracket, and it's an awesome addition to my rig.

Adding a Vmount to your rig increases the weight tremendously but can also help reduce some hassle, especially, if like me, you are using a monitor as well. My monitor is an OSEE T5, and it likes to absolutely chew through the Sony NPF style batteries, so I'm always changing them like twice on shooting days. With this Vmount battery, I can plug in a usbc-to-usb micro cable, and power the screen off it for the entire day no problem.

I have one other Vmount battery, and this K&F has some big advantages. One, it's smaller than the competitor in every dimension, which is great for cuttings some bulk. Two, the screen is much more useful and provides pretty much the easiest way to tell how long its going to last - a run time meter! This is so awesome and being new to v-mount, I didn't even know it existed. On the screen of the K&F, you can see both USB port voltages, the battery voltage and bars%, as well as the current runtime for the output you are using. I have not used this to power my camera or other accessories quite yet, but seeing that number is incredibly useful.

One complaint, which might be a USB restriction, is that my display refuses to work on a USBA-to micro cable. I'm not sure if this is because USBA can't resolve above 5v or what, but I have to use a C-to-micro. PD on the USB C port works as expected, and is very useful because to power an R6, you have to use that. Unfortunately with my current cable set, my display cable blocks my USB port on my camera, so I wasn't able to power both the camera and screen at the same time, but I'm sure that's possible with a cable change.

Overall for the price of this battery, it's awesome. I would say that you should refrain from dropping it, as you should with most camera gear, but the plastic on it does not feel super thick. The vmount has a plastic plate where it contacts the receiving end, and feels just fine. It's attached with 3 screws so if you do break it somehow, it could theoretically be replaced.

Charging this over USBC works fine and charges the battery up in some amount of time (I always charge the night before shoots so I don't really care). If you look at the screen while charging, it does actually show that the voltage resolves to 20v, so make sure you are using a PD-compatible charger to get maximum charging speed.