As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT #2154 SJU-SJU. RETURNED TO GATE TO INVESTIGATE A BATTERY TYPE ODOR IN MID CABIN. (NOT FUMES).;COMPLIED WITH INFO NOTICE 2017-T015M. FOLLOWED TSM 05-50-00-810-831-A. AS PRECAUTIONARY C/W TSM 24-00-00-810-823-A. NO ODORS ARE PRESENT. PACKS OPERATED FOR MORE THAN 2 HRS AND FOUND GOOD AIR QUALITY. AIRCRAFT IS GOOD TO CONTINUE SVC.