Customer called with a 2008 Prius giving the red triangle of death and P0A80, P3000 DTC. I had recently installed a new 12v battery (OEM) in the car. Visited customer. Dr. Prius showed small Delta State of Charge (5%) which is an indicator of a bad module. However, the monitor screen did not show any obviously bad modules. Ran life expectancy test, which immediately skipped the "charge" phase (which means that the voltage/SOC was already high enough for the test, which it wasn't). I started to suspect an issue with the battery ECU or corrosion on the voltage sensing wires. The test showed 11% battery life. I ran the test again and it showed 26%. Both times the test, which normally takes 20 minutes, took less than 5 minutes to complete. I saved the results and removed the battery after removing the orange safety disconnect plug. While the battery I saw that some of the normal battery brackets and bolts were missing which told me that someone else had already been here. I installed the reconditioned battery I had brought. I tested the battery before reinstalling the storage area trim. As typical, errors were still there. I cleared the errors using Dr. Prius (I did not need to get my xtool d8 out). Turned the car off and back on and everything was good. I ran the Dr. Prius life expectancy test and got 86% which I consider good for a recon. Test drove and monitored regen. All good. Buttoned her back up and on my way with the old battery to attempt repair of.
Follow-on: Initial findings on the old battery showed that someone had already been inside it and numbered all the modules. Some corrosion present on module terminal nuts but not terrible. ECU connectors do not show any corrosion. Evidence of module electrolyte leakage however. This battery will go thru the reconditioning process and be tested in my own car before resale.