Dead battery

My prius has relatively low miles @ 60k miles. My girlfriend left the interior lights on for a period of time and tried to drive it the next day, it got down the road when it died. The traction battery shows 1 bar and when I tested the 12V and it was low so I put it on a charger and charged it back up. But it wouldn't start, when it's put in drive it will only go into neutral. I disconnected the 12V and let it sit overnight and I reconnected it and tried it again the ICE started up for a few seconds and dies. It has gas and he gas gauge shows 3 bars. I connected a obd2 scantool and torque is telling me 13.8V lowest and 14.4V highest block. I called a prius shop and they said to replace the HV battery. But is it possible that all it to run is it to charge the HV battery? The SOC is too low?

 

Yeah the car started out as a parts runner whenever we need shop supplies. It started to sit since when they first got it and I put a 12V trickle charger because it would sit for long periods of time without being used. I only wish I knew more about it at the time and I would have got something for the traction battery. But only after asking over and over when they are going to get rid of it (they didn't like its styling) that they replaced it with a pickup and I bought it. It always had been maintained by the dealer and I could get it up to 40mph before the ICE would kick in so it was a no brainer for me.

 

About two months ago I had the inverted coolant changed, so now that you say that I wonder if that's what is going on.