Update: I returned to Phil's to buy a new battery due to corrosion pointed out at my oil change and bought a new Napa battery based upon the owner's recommendation of that brand being superior to the brand I previously had (which was almost five years old). After the battery installation I experienced a few days of difficulty in starting my 2006 Scion, an issue I had never had before that in the history of the car. I alerted the owner to the details of my issue and he suggested that they replace the new battery in case it was a lemon which they did at no charge. Unfortunately the problems continued (right through a time when I was moving in June and really needed my car to be reliable, very stressful) so I doubt that it was the battery itself being bad, and told this to the owner who asked me to keep him posted. Perhaps adjusting to the new efficient battery had overloaded the other older components - not sure. A mechanically-inclined neighbor said he thought the issue was some sort of "vapor lock". Oddly enough a few days later the problem resolved itself as suddenly as it began and has not happened again. The owner Bryan was very responsive and I would not hesitate to go back to this facility again.