Perhaps as a consequence of the excitement of just having had the 10,000 mile maintenance done along with required state of Virginia safety inspection ($15) spouse who owns the 3/31/2005 purchased 2005 Prius #2 Silver left Power on overnight. When I saw it around 4:30am I turned the Power off. When spouse/driver left at 6:00am the Prius seemed fine.
If the Prius was left in Ready mode, the ICE would start if the HV Battery charge got too low. If it was left in Acc or Ig On, batteries drain without recharging. Without lights or AC on, however, there isn't much battery drain. No harm, no foul.
