yup ProTek Pack for mine. the 2300mah lasts around a month or so on a single charge racing 2-3 times a week.
It came with instructions on witch way to put the pins in the connecter and witch way to plug it in..
i went a step further and broke out the exacto blade and marked witch side the positive wire should be on.. (my helios the pos wire is on the pin closest to the back of the radio)
Looks like proteks pack is a 2800 now
Makes sense it will last a bit longer.
http://www.amainhobbies.com/product_...k-111V-2800mAh