My Teric is about 2 years old. The battery was fine for the first9 or 10 months, then took a nose dive (e.g. losing about 10% per day - yes, when turned off the whole time). The replacement battery was ok for about 9 months, then took the same nose dive as the first. The third battery is about 4 months old, and I haven't been diving (whah!) since it was replaced. I see right now that the battery is at 62% after 4 months (off the whole time). I think that's really good.
In my case, the battery crapping out happened on both occasions within a few weeks of being dived a lot. Maybe that's just coincidence, but I'll be holding my breath for battery #3 until it's done a bunch of diving.
There are lots and lots of posts on SB about the Teric battery, just search "Teric Battery", including a poll. My second battery was replaced after the supposed bad batch of batteries was taken care of, and it died as quickly as the first, so for me the jury is still out.
I have a strong preference for the watch form factor over the wrist-brick, otherwise I'd prefer the Perdix AI hands down.