I assume they sacrificed AA battery for size. The battery lasts for 40 hours. Even if it loses half it's capacity, it'll still last for more than I need for one day. Especially if I have two. These are almost priced as expendables. Once they eventually fail, you buy a new one. That is, if it's not changeable.
If you check out the crowdfunding campaign you can buy a set of tentacles a lot cheaper than what it will be sold at eventually.
I would like to stress the sync software that comes with it, that is really the highlight of the system. With it you can sync your dailies within seconds, minutes at most. It takes native camera files and syncs with audio, creating a new file. So for the editor it's like working with camera audio.
It can sync with TC embedded in the file or TC recorded as audio. The latter takes a bit longer, of course. You can literally sync everything on the way back to the airport.
This system enables TC based workflow even when shooting with a 5D and a Zoom.