Hello, new to hobby and forum.  Please don't haze me too much but I cut a battery strap that was holding the main board to house a larger battery.  The battery fit barely but was nearly impossible to remove.  Based on the outcome can I assume that the main board electronics need to be level to operate correctly?  The hovering and pitch and roll seem ok but when I yaw the unit just flies across and down and out of control which made me believe at first I was in mode 2 but am not.  The main board is now angled which I can repair but just checking the board needs to be level to the unit to operate correctly.  The is a basic syma X5C-1 which was a nice flier and met my current skills and needs.  Thanks for any advice.