I'm hoping I can get some help from you folks. I came downstairs to my Prius v with my kids and our laundry to find a completely dead car. I couldn't open the trunk. Luckily the doors were already unlocked. The power button doesn't work at all. No lights no nothing. It is DEAD. Is it possible the battery discharged and I need a jump? Or is this more serious and I need to get it towed to the dealer?