What was found
AFTER BATTERY REPLACEMENT FOUND ELEC LIGHT ILLUMINATED. MAINT MSG ON P5-13 SHOWS 'AUX BAT CHARGER INOP'. INTENDED SWAPPING BAT CHARGER MAIN WITH BAT CHARGER AUX. DURING REPLACEMENT / SWAP POSITIVE LEAD TOUCHED AND ARCED ON BAT CHARGER HOUSING. POSITIVE TERMINAL AND AUX BAT CHR NEED REPLACEMENT. AUX. GROUNDED - YES. REMOVED SHIELD OF WIRE AND DEFECT TERMINAL PER WSPM 20-00-15 AND 20-30-11. 5 CB'S: SPCU NORMAL (B1), AUX BAT CHARGER (A3), BATTERY CHARGER (A4), BATTERY BUS (A5), BAT CHGR (E1) PER B737-900 AMM 24-31-21, AMM 24-31-31, AMM 24-31-11. BOTH BATTERIES DISCONNECTED. INSTALLED NEW LUG ON BATTERY CHARGER REF SWPM 20-30-11. NEW AUX BATT CHARGER INSTALLED, BOTH AUX & MAIN SECURED PER AMM 24-31-21 & 24-31-31. BOTH MAIN BATT'S INSTALLED PER AMM 24-31-11. BATTS CK GOOD PER AMM 24-31-11, CHARGERS CK GOOD PER AMM 24-31-21 & 24-31-31.