As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED CAPACITY CHECK, BATTERY PACK PN 61-2275-1, SN/9808677 WAS REMOVED FOR SCHEDULED CAPACITY CHECK ON 4/20/04. UNIT FAILED CAP CHECK ON 4/29/04. MAINTENANCE REPLACED BATTERY PACK CELL PN 61-2274-1 UNIT CHARGED AND PASSED COMM TESTS. A/C RELEASE DATE 5/01/2004