I've been using the K&F CONCEPT 10500mAh Battery in an adaptor plate that provides both D-Tap and USB outputs (clamped to the leg of my tripod) to power both my field monitor and Sony A6700 dummy battery quite happily. There is plenty of capacity available to power both for several hours!

The ribbed case of the battery not only looks distinct from other batteries, but also provides a better grip over its smooth cased competitors (very nice when wearing gloves). The glossy panel at the rear covers the OLED screen and has a capacitive touch switch where the K&F logo is to activate the screen. The glossy panel is very much a fingerprint magnet, but does wipe clean easily.

If mounted as a NP-F battery on my monitor, there are 2 USB C and 1 USB A outputs available, there is a 'rubber' cover over 1 each A & C sockets and the C type socket used to charge the battery also doubles as another output.

Total output is rated at 22.5W, and charging, using a PD adaptor at 45W. I'm not certain how rigidly the 22.5W output is applied, as I suspect that my camera and monitor may slightly exceed that draw when the monitor backlight is at maximum power.

I recently noticed that 'holding' the power button (logo) for a couple of seconds will switch the display to Watts, and show the total draw from the battery - nice!

If the battery is fully charged and not immediately used, it will self discharge at around 3% each week (assuming it is linear)

The inclusion of a plastic cover for the front of the battery, giving some protection to the terminals is, in my opinion, a practise that should be adopted by other brands, It just makes sense!

Happy to give it 5 stars, it's been doing soveriegn service for me in local woodland hoping to capture video of the local wildlife.