It has a QR scan code...think that is for the battery?I do see the battery, but it looks white with yellow stripes. No helpful sticker for the battery specs like on the DB1, but they should be similar. Wonder if I could get a replacement from Aliexpress? Can't quite make out the writing on the battery picture though, is there a larger clearer pic?
P.S. Never mind. It seems it is a 602025 Li-Po battery, 3.7V 220mAh. I'll see what I can dig up, they seem to be about 1usd+shipping. BTW model number seems to be linked to the size, 6.0mmx20mm25mm.