RE: Lipo advice GWS Slow Stick
The SS will carry about any size battery as far as weight goes, but if you have the 300-350 motor a 2s is the limit for these motors. Yours has the grey gear box, right???
I have flown mine with several size batteries from 1000ma to 2600ma, my batteries are mounted under the CG so different weights are not a problem. If you have a motor with the black gear box it is a 400 motor and will take 3 cells with a change to the 9X5HD prop. Be sure to check your CG after you change batteries as the difference it weights will make a diffference. Also dont run the battery down below 3v per cell if your ESC is not Lipo compatable.
Good Luck
Bob