As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A STEADY BATTERY CHARGE RATE OF 15 TO 18 AMPS WAS OBSERVED DURING CLIMBOUT. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED THE BATTERY CHARGER, MAIN BATTERY, AND SENSOR. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.