I got in my truck the other morning and heard a battery low message come from something. At first I thought it was my fire dept radio but found it was off. I then looked at my scanner and it was off even though I left it plugged to a usb charger. I have formatted the sd card and programmed it with the sentinel. I tried another sd card. I took my batteries out last night and left it till tonight. I tried the reset by pushing the keys I read about. It still will not do nothing and just out of warranty. What should I do ???