I bought a weather station with the intent of putting the 5 in 1 sensor array on the roof. The sensor array requires 4 AA cells which I really don't want to be climbing up on the roof to change. I figured I'd just find out what voltage it uses and run a wire down and plug in a 7.4v lipo pack with the appropriate voltage regulator. Well, I got the weather station and the batteries are wired like this: Why did they do it like that? Why have two positive leads and one negative lead coming from the battery pack to the pcb? Why not a single positive and single negative? More to the point, can I run a wire from my 7.4 lipo pack up to the weather station, reduce the voltage to 3.3v with a LD1117v33 voltage regulator and drive both positive leads on the pcb. Or, should I use 2 regulators just to be safe?