At least in the photos of the back of the HyperDeck Studio HD Plus on the product page, what is printed below the DC input port is 10-14V @ 5A. Not sure if that is what is printed on your unit.
One thing that is a bit odd is that this doesn't really match up with the 100W maximum power consumption listed in the specs (10V @ 5A would be 50W). It's also a bit surprising that the power consumption figures of the HyperDeck Studio HD Plus and HyperDeck Studio 4K Pro are identical at 100W (I would have expected the 4K Pro model to be higher than the other models).
The other issue is that if 10-14V is the true supported voltage range, then it may not work directly with most 14.4V lithium-ion V-mount batteries when fully charged. These batteries tend to use four lithium-ion cells in series, and the voltage range of an individual lithium ion cell ranges from 4.2V (fully charged) to around 3V when discharged with a nominal voltage of 3.7V. This means that the overall battery outputs 16.8V (4 x 4.2V) when fully charged which would be outside of the printed voltage range.
10-14V is more in line with the voltage range of a lead acid battery. So if that range is accurate, it might require a voltage regulator that outputs 12V or so for use with a lithium-ion battery. The HyperDeck Manual only mentions powering with an external 12V battery, so that doesn't really do much to clarify the DC power requirements.
Note that the ATEM Mini Pro ISO has a DC input voltage range of 9-20V and maximum power consumption of 36W as discussed in this thread:
viewtopic.php?f=4&t=123479