As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING BATTERY CAPACITY CHECK, ALL BATTERY PACKS FAILED CAPACITY CHECK. REF TO PEMCO NR 14093.0034 REMOVED AND REPLACED BATTERY PACK IAW B737 AMM 33-51-06 OPS CHECK GOOD. S/N OFF 288072, S/N ON 297958. WORK PERFORMED BY P707, ENTERED BY V927860