Hi, i want to build a mod from scratch with two 510 connectors, a bit like the E-Hose by starbuzz, i was just wondering if 3.7v will go to both connectors or if half the voltage will go to each connector, if so will i need two 3.7v batteries? Also im a bit confused with the batteries i have to use as some people have told me its fine to use unprotected, but there wont be any circuitry in the mod so i should use protected batteries right? Thanks in advance