I picked up one of these awhile ago and it is just slightly taller than an ego 1100mah and fatter, but very portable and feels nice in the hand. At 1300mah, it last a long time, which is what I want since my smaller vv is a twist (900mah). My other vv batts (like the vamo and provari) are just too big for me to lug around on a daily basis, and since I vape around the voltage points it offers, I am really happy with it. The only problem is charging. At first I almost couldn't get it to fit on the charger, then I shaved off some with a dremmel tool (both sleeve and base) and now it works good. I said good not great because sometimes it goes green too quickly and I have to remove/reattach it, and then it goes back to charging. I always turn it completely off before charging, and that seems to help.
Any ideas on charging that anyone has found that works best?
Color for voltage makes perfect sense: think kelvin scale, higher number bluer (i.e. 9000k), lower number red (1000k).
Saludos