REFLECTOR: battery

[Grigore Rosu]

Hi,

I am a new builder of a SEFG (fast-built) and I have already finished the 
speed brake and the control system (most of it in the head start program). 
Now I'd like to try the speed brake actuator as well as the trim (the one 
in the fin of the keel).  Therefore, it looks like I need to buy a 
battery.  Which one to buy?  Are there any suggested batteries for 
experiments during building?  I guess building will take several years, so 
I may want to buy another battery anyway for the final installation ...

Also, I see that the trim has only two wires going out, a black and a 
red one.  Should I just swap the + and - to get the two different rotation 
directions?  And since I am at the silly questions, should I get a 6V or a 
12V battery?

Thank you,
Grigore