K&F Concept’s 99Wh V-Mount Battery with PD100W

The K&F Concept’s 99Wh V-mount battery is a versatile V-Mount battery with 6700mAh of capacity. It weights in just under 635grams. It’s a flexible battery offering charging dtap or usb-c charging. It takes advantage of high-power USB-C power sources, charging up at 16v/ 5a from my power bank for 80w of charging, from a wall socket the built-in screen suggested it was charging around 99w. Using USB-C it was charged in around 2 hours. This is a great advantage over older dtap only batteries – if you are around a high power dtap charger use it – but a good USB-C wall charger can potentially charge two batteries at once; and is much more compact than my dtap power brick. Using USB-C also needs less kit in my bag’ I always carry a few USB-C cables and most of my other kit charges up from usb-c too. K&F include a good 240w rated usb-c cable in the box.

Regardless of the charging source the screen shows a clear display of the state of the battery charge and lets you know which of the various outputs are discharging when its charged. When charging there is an accurate time estimate to charging being complete. When using a high-power source, the battery does get warm whilst charging.

Power output the flexibility continues; you can run use the vmount port and the BP ports will power your device happily. I have used it in a loop for the last few days running a large LED fill light for the last few days. The screen on the battery shows the drain as 70Watts (the panel of the light says it’s a 70w light, so the meter is accurate.) I found the VB99 lasted a little over 2 1/4 hours constant running on that light. The light runtime is on the higher end for my vmount– if you are shooting off grid this will keep a low power camera rig going for a long while.

If the battery is flat when you need it, you can use the light in an adhoc UPS mode charging and running at the same time; just make sure your input power is greater than the output. Running the light and charging from the same wall adaptor; it added an hour to the charge time which is a good compromise.

Besides the vmount port the battery gives you a 12-volt DC connector; a pair of USB-C’s and a usb-a. Total output is limited to 100watts. I could run the light and power a camera via a usb-c cable at the same time. The batteries usb sockets all sit behind a weather flap; that I found difficult to open with my trimmed nails.

When in use the screen is usually off; there is a button on the side that will let you check the status. You can long press that button to turn on a small light in the back of the battery which is useful for lining it up with a mount in low light; you do need to turn it off again – and the screen doesn’t warn you it’s on. It’s a great idea the UI should warn you it’s on; or it should power off when connected to a vmount.

The manual says the screen face is scratch resistant; time will tell on that. The surround of the battery is metal; which should help keep some heat down in charging; and especially surprising given the relatively low weight – it’s almost 150g lighter than my next lightest 99Wh vmount.
K&F have been on a roll with quality products recently; this vmount filter is another sign they are coming for the professional market.