I got 15266 3.0v protected li-ion (ultrafire?) CR2s from Madvapes. They're green.
He also has/had 15270 --- everything else is the same... They might be the same battery? also green. I think they tried to do something slightly different and they came out the same? You could email him with that specific question.
NOTE: Since they're fairly small capacity
batteries they also have a fairly conservative max discharge rate which means that the cutoff current to trip the pcb is pretty tight. What does all that mean? I have to use atomizers/cartomizers with a resistance of 3.0 ohms or greater. 901 atomizers are right on the edge but usually over. KR808D cartomizers are about 50/50 and lately maybe a bit more are under than over. I have found cartomizers that are 3.1 - 3.4 ohms elsewhere.
These are the only protected, 3.0v, CR2 batteries I've found. If you find others please let me know. Nothing wrong with these but I suspect they may quit making them. Usually last me a good 3 to 4 hours. I rotate 3 pairs and have 3 more pairs in my stock drawer for when these give out -- no clue when that will happen. I recharge them maybe once a day or less so I might be set for 3 or 4 years
I suppose you could do HV atomizers but I guess I like a few more watts than most -- around 12 - 14 watts. and they charge a premium for hv attys.