i've had this problem, i had batteries which worked fine in my etek1 but whenever i'd shoot my ego8, the board would shoot all sorts of problems my way. like dave said, Just try a brand new fresh battery, see how it goes because batteries will work kind of differently depending on what they're being required to do; whether it's a LCD display screen or LED lights. (And none of those ****ty poundland batteries, those things NEVER work)