This problem has been, at the least, very frustrating. Leaving to go to work, just to find a dead battery after you just replaced it, makes you a little pissy. I wouldn't have trusted my Hyundai dealership to find it, because I've experienced bad customer service from them before. Thank goodness my husband found the problem and now we can move forward. I think Hyundai should replace the audio unit for no charge, since this is obviously a factory defect, but I'm pretty certain there's no chance of that.

Purchased car used 3/25/10 with approx. 21,000 miles. Six months later, on 9/20/2010 battery dead, Hyundai dealer installed new battery, prorated at $85.50; we paid $95.86; mileage 24,378. On 10/28/11, after only 13 months and 10,672 miles later, battery again dead and we paid $166.89 for new battery; mileage 35,050. On 1/4/12, 9 weeks later, battery failed again and was towed to dealer 42 miles from our home. They tried to blame battery failure on "headlamps left on" (which obviously go off when key removed from ignition.) FINALLY on this date dealer performed draw test and found draw too high, so removed fuses and draw went away, so diagnosed failed audio unit cause of draining battery. They then replaced the fuses and let this 78-yr. old customer leave, knowing full well the battery would continue to fail due to continual draw on battery. WHICH IT DID, 3 MORE TIMES IN THE NEXT 2 WEEKS!! On 1/18/12, my wife & I got in the car to go to my Dr. for 10:00 appointment, and you guessed it....battery dead again. After jump from neighbor, I returned AGAIN to dealer when the Service Mgr. removed audiio fuses so battery wouldn't die again, and informed me audio unit was now out of warranty and our cost to replace would be "between $600 and $700!!!! Needless to say, it is evident from these dates and facts that on 10/.28/11 (at the very latest, and possibly as early as 9/20/10) the Hyundai dealership misdiagnosed the car as a battery problem, and failed to perform tests to find the real cause of battery drain. And now they want ME to pay for a new unit. We contacted Regional Svc. Mgr. whose only help was "call Hyundai Consumer Affairs", We did and they repeatedly promise us a return call within 3-4 days--NOT) and they continue to be unresponsive since 2/1/12. It is now 2/15. Other than consumer advocates ((TV, etc), where can we go from here?