What was found
RETURNED TO FIELD. CLIMBING THROUGH 5000FT, DETECTED A VERY STRONG ODOR THAT SMELLED LIKE BURNED PEANUTS. ACCOMPLISHED QRH, ISOLATED BLEEDS AND PACKS. LANDED BEFORE ELECTRICAL ISOLATION. ODOR WAS PRESENT THE ENTIRE TIME, ALL THE WAY IN TO THE GATE. FOUND EMERGENCY BACKUP BATTERY OVERHEATING, REPLACED THE BACKUP BATTERY IAW AMM 27-03-05/401, AND FIM 21-20-00-810-801-A.