However, if you want to increase your run time to 5+ hours then the 1500mah is the answer. Or, get the 2500mah for 7+ hours of run time.

Simply remove the back battery door cover, unplug the existing battery and replace it with this 1500mah or 2500mah pack. Now you have the power to sail all day. As a back-up, keep your 600 mah battery and if you even do need a little more time, it only takes seconds to switch battery back. Fits all the Futaba, JR, and Spektrum radios requiring Square pack.

NOTE: High capacity batteries take longer to charge. With the 50mah charger that comes with your Spektrum, it takes battery cappacity / charge rate = hours to fully charge. Thus a 1500mah /50 = 30 hours to charge and a 2500mah /50= 50 hours. It is recommended you get a high rate charger like the Vision Peak Ultra (see chargers) which can charge at .1 to 5 amps... at 1.5 charger 1500mah in 13 min. Wow!