Hybrid battery fan issues

I've got a 2009 Prius that we have owned since early this year. Just in the past couple of weeks, We have noticed the SOC drop from about 3/4 full down to one bar (based on the MFD). We've also noticed that the battery seems to not hold a charge very well while driving around. Sitting at a stop light for a couple of minutes, the HV battery's charge will drain and will take a good 5-10 mins (3 miles) to charge back up above two bars. I decided to run the Dr. Prius tests on it. It told me that there is poor balance in blocks #9 and #12. I did the test a few of times so I could see if anything else was wrong. After about the third time testing, Dr. Prius started to give a warning saying that the battery was running warm. I checked the temp, 115°F. - 118°F. Ok, I was doing some hard acceleration and deceleration for the test. So I gave it a break and drove it normally for 5-10 mins. The temperature started to climb up to 122.9°F. by the time I got home. So I cleaned the HV Battery fan. It wasn't too dirty, for being cleaned for the first time. Put everything back together and took it for a test drive. Battery SOC dropped from 6-7 bars down to one bar on the MFD, just from backing out of the drive way for 5 seconds. Got Dr. Prius up and running. Noticed at a stop light, that the A/C was on high and drained the HV Battery, but when I took off, even though Dr. Prius showed that is was charging the battery, the SOC on Dr. Prius dropped from 45% down to 35% and in the red zone. Temperature by this time had gone up into the red zone and over 123°F. The SOC stayed below 45% for about 3 miles. I am now aware that the battery seems to be running hot and the fan won't go on high unless you override it in Dr. Prius. The big question is why and what could be causing this? The car has 163k mi. on it. The previous owner said that the hybrid battery was replaced. (Don't know when it was replaced or whether it was a new or reconditioned one.) Everything else is great about the car (other than the JBL CD Changer thats doesn't work, but that's minor in comparison to the HV Battery). The other thing is that I believe water has made it's way in from where the hatch hinges mount to the body. Above the HV Fan is rusty along with the metal bracket on the HV Fan. This connection to the right of the fan is also corroded on the same two wires on both sides of the connector. Not sure if this has anything to do with the problem. I'm sorry for the long post, but hopefully everything makes sense.

 

Here is the connector I was talking about. In the pictures, you can also see the rust I'm talking about that's above the HV Fan and this connector.

 

I did check the 12 volt battery this morning at it is at 11.8/11.9 volts with the car on but not in "ready" mode.

 

Ok. I checked with the MFD maintenance screen, Dr. Prius, and Torque Pro, but not with a multimeter yet. I will do it though.

 

I have tested about 5 or 6 different Prius and the Delta SOC always says 0 which never makes sense to me. The 2009's resistance is up there around 26-27 ohms. The fan works perfectly fine manually in Dr. Prius. After watching it a little more, it seems to not go above 2 (out of the 6 speeds). I decided to compare it to my 2012 (yes I know it's a different generation) but the battery temps were up there. My fan was on three and seemed to be cooling efficiently. My 2012's battery doesn't jump around like the 2009's does. I figured it's a reconditioned battery based on the way it's been acting. So pretty much now just sit back and wait for the triangle of death to come on, correct?

 

The only hybrid shop I know of is Tampa Hybrids in Tampa. I have met Todd before and he is very knowledgeable. Not sure if that is who you are referring to, but was wondering if you could recommend something around the Ocala area. Tampa is about an hour and a half drive for me.

 

Thanks