This K&F Concept 99Wh V-Mount battery has a TFT display, and without anything plugged in, pressing the activation switch on the left hand side gets it to display the current state of charge. If the battery is being used to power something, a table is displayed with the voltage and the power drain in watts, along with the current level of charge for each outlet.
On the back of the battery is the V-Mount itself along with the standard configuration for charging it up on V-Mount charger or fitting onto a dedicated holder on a camera rig. Oddly, the V-Mount is made from plastic whereas they are normally metal. In addition, there is a small lamp that you can turn on by holding down the power button on the side for a few seconds - switching it off is the same again. This gives you enough light in a place where there is no lighting to see what you are doing and can be very useful.
On the left is the aforementioned power switch which just switches on the display. On the right hand side is the D-Tap socket which you can use for lighting or anything else that takes power from the socket.
On the top are: one USB A; two USB C sockets which including super fast charging (100W); and, a 12V DC socket. The lid for the D-Tap socket comes out and is on a little rod - rotating this takes the cover out of the way.