AN UNPLANNED IGNITION OF BATTERY GAS OCCURRED AT 3 AM ON 9/19/00. THIS OCCURRED AT ENTRY 1 XC 233+25 IN MAIN WEST BATTERY BARN. #1 SCOOP BATTERY WAS BEING CHARGED. WHEN EE CLOSED THE LIDS IN P REPERATION TO CHARGE, HE HEARD A LOAD POP. EIGHT LIDS (CAPS) WERE BLOWN OUT OF BATTERY. NO INJURY RESULTED.