We went through 4 batteries in less than 4 years and constantly charging it. Our dealership had it for 5 days and couldn't figured it out only find the battery not capable of holding the charge anymore, hence the 4th battery. One week later the new battery on our sedona was dead. My husband took it in...again... and they tested it again. This time they found what had been draining our battery.. THE RADIO HAD A SHORT IN IT. I had told them that we had noticed that the radio ran extremely hot after a short while of having it on... (less than 2 cd's playing). Needless to say they disconnected the radio and we are waiting for an new one.... I'm not sure if the warranty covers it due to the fact that this obviously looks like a defected radio out of the manufacturer's warehouse or someone didn't installed it right. I will be contacting them.