As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY BATTERY PACK M1670 DOES NOT HOLD CHARGE. REMOVED; REPLACED AND PERFORMED A GOOD CHECK OF BATTERY PACK AT M1670 IAW SWA B737 MAX 8 AMM 33-51-06;[02] REMOVED; REPLACED AND PERFORMED A GOOD CHECK OF BATTERY PACK AT M1670 IAW SWA AMM 33-51-06