If it was a battery it probably would have been a design based off the 18650 battery. Which looks like a larger AA. It's very common size for all kinds of items from ecigs to electric cars.
If they are trying to make it a long lasting pack they would need to find a way to increase the MaH's (milli amp hours) to extend the depth of discharge rate for the battery. The voltage was likely 12vdc or possibly 24vdc.
You can extend the MaH's by hooking multiple batteries up in parallel or raise the battery packs voltage by wiring multiple batteries in series but the MaH's will not increase.
The problem I see with UAT and their tech is that items like battery packs, drones, and wind turbines is that those items fall into the tech sector.
Even if they have the best of each of those 3 items at this exact moment (unlikely) they will be outdated within a years time, likely 6 months time.
They need to get tech to market because the landscape advances so quickly, just look at any piece of tech. Just a few years ago I was amazed and excited I could get 4 gigs of RAM in my phone to speed up processing information. Now 4 gigs is fairly standard in any of the top phones.
If they don't release items to market in a timely fashion, they'll be outdated by the time they sign the manufacturing contract. And if they're paying to constantly update and engineer a product to meet the latest standards they're wasting money unless they can sell it.
When companies release an item for sale they usually already have a better one halfway designed and completed, so they can sell the "new amazing one" everyone buys it and funds the completion of the next "new amazing one" that's already pretty much completed.
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