Hi All- Noticed Sunday night that cd/nav on 2005 H2 would not stay on. When you press power, dark gray screen with digital clock in lower right comes up, stays on for less than ten seconds then shuts off. Cannot get to radio, cd, nav screens- nothing but the gray screen. Didn't drive anywhere Monday and Tuesday morning battery was dead. Don't know if coincidence since accidently keys were left in ignition or if other issue. Fuses look ok- Tried to charge brand new battery and now wont take. Put in spare and H2 started right up. Any ideas ?

Thanks!
Marieke