Lemme guess - Honda IMA “hybrid” system? When I worked at the local dealer a while ago, it wasn’t an uncommon sight to see a newish Civic/Accord Hybrid or Insight come in for a new battery. It’s a rather “simple” system compared to Toyota Hybrid System(no inverter, lower voltage and no water/glycol cooling loop) as it’s all 144V DC but it also had some shortcomings - the battery was all D-cell NiCD/NiMH and didn’t have great cooling. The auto-stop system only worked for 2-3 stops, and there was no cooling for the ISG that performed the tasks of starting and generating power - Honda wanted to keep it “simple”. The Prius is a very hated car - even by its owners, it doesn’t excel at anything but it doesn’t entirely suck. It did, however prove Toyota’s hybrid technology. Many examples of such hit the 200-300K mark - especially in hard taxi/Uber use - but in rough shape. people are rebuilding batteries for Toyota/Lexus hybrids in their garages or backyards and the system itself has proven pretty reliable.When the issue cannot be diagnosed by the dealer and it is a larger problem waiting to happen. Hybrid, 9 years old only 90,000 miles on it but the gas engine refused to shut down at stop lights or even coasting, started several months ago, dealer says it is fine cannot find any issues. How do you tell the dealer that his tech has not idea what he is doing. I know when the engine is not running right after 9 years. So, I gave up, also fearful the battery was going to go and that would be $5,000 to replace. Car worth about 7500.