DigitalFoto's L-Series to V-Mount Battery Adapter allows you to power any V-mount/V-lock light, monitor, or other piece of equipment with two Sony-type L-series or NPF batteries. The combined voltage of the two NPFs will be 14.8V, which is the standard output power of a V-mount battery.
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I picked up 2 of these - thinking that, if they work, they'll give me some flexibility for not a lot of money. I installed the adapter on a 5600k 1080 LED panel light, then installed 2 x generic new-ish 8800 mAh / 65 Wh L series batteries. At full power, the light ran for just under 100 minutes. Then I tried installing 2 older Sony NP-F570 batteries - 2100mAh / 15.8 Wh. The light wouldn't power up. The lesson I'll take from this test is to use only high-capacity batteries. The tabs that hold the batteries in place are plastic. This wouldn't be a robust solution in a production environment, but I'd recommend it if you have a lot of L series batteries and might occasionally need to power something that has a V-mount plate.
Got this to power a large field monitor, with this adapter I can power a teradek receiver and a 17.5 inch monitor with npf batteries which is a far cheaper option than using vmounts. The adapter works as advertised and have had no issues with it so far.