EE WAS ATTEMPTING TO PLACE A 12-VOLT BATTERY INTO THE BATTERY COMPARTMENT, WHILE AT THE SAME TIME TRYING TO HOLD HINGED COVER ON THE BATTERY COMPARTMENT OPEN. WHILE LOWERING THE BATTERY INTO THE COMPARTMENT, THE EE INADVERTANTLY PLACED HISTHUMB BETWEEN THE FRONT PLATE OF THE BATTERY COMPARTMENT AND THE BATTERY, SMASHING HIS THUMB.