My 2006 Prius batteries died and it has taken the dealer 3 weeks to get the pack made and sent from Houston. Now they tell me that my auxiliary battery is bad and want to charge me $300 for a new one installed. The dealership says this is the first battery pack replacement they have ever had to make on a Prius, so I am suspicious that they fried the auxiliary battery when they did the installation. The battery pack was under warranty still but the car has 114k miles. Has anyone had any experience with this to know if the auxiliary battery would be affected by the failure of the battery pack or installation of a new pack? I don't want to pay for their inexperience if it was their fault. That is an expensive little battery.