By a 3.3 volt battery, I'm thinking you're referring to an eGo battery. A 1.5 ohm MAY work, but it would be putting a lot of strain on so small a battery, and you don't want electronics inside to lose it's magic smoke (burn up, no longer fire)...
When you start going to lower ohm
coils, it's best to have a more substantial battery and PV....
