As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"ELEC" LIGHT ILLUMINATED UPON CLEARING RUNWAY. COMPIED WITH QRH. GROUNDED - YES. PERFORMED B737-900 FIM 24-31 TASK 801 AND FOUND AUX BAT CHARGER INOP FAULT. PERFORMED FIM 24-31 TASK 825 AND FAULT CLEARED AND AUX BAT CHARGER OPS NORMAL.