Still getting P3000 code after replacing bad module

I am a little new to this, so please forgive my ignorance. My daughter has a 2007 Toyota Prius with about 172,000 miles on it. She got the red triangle along with the VSC, ABS, etc. warning lights. It threw a P3017, B1400 and B1421code. After digging into the code reader (Genesys EVO), it said that block seven was low (14.85V) as opposed to the other blocks reading anywhere from 16.19 to 16.23V. I removed the battery and after finding the faulty module (all the others were within .1-.2 V of each other, I replaced it with one I ordered from HV Hybrid Parts. All of the modules were within a .1-2V of each other. The reader also showed that the internal resistance on each module was at .019, so I took it for a test drive and everything seemed good for the first 5 miles of driving it on the interstate until the red triangle and other lights came on.

After I got it home, I disconnected the 12V battery for a couple of hours and then hooked it back up and the lights reset themselves. I drove it over the weekend and everything looked good (including increased gas mileage) for about 60 miles then the warning lights came back on and had a major loss in power. I disconnected the 12V battery again over night to reset the warning lights so I could get it back to work to check the codes again. The lights came back on after about 12 miles. The only code it has thrown since replacing the module is P3000 in the "hybrid vehicle ECU". It shows no codes when I check the "hybrid battery" option. We also drove it with the code reader plugged in to see what the voltage was showing. When climbing up a steep hill for a mile, the voltage between the 14 blocks never had more than a .5V variance. I never balanced the battery after replacing the module through charging and discharging as many have recommended, but I would have thought that this would have shown up by having a great than .5V variance between modules under a load. I am considering just purchasing a remanufactured battery, but want to make sure that is the problem. I would have thought that if it is, it would have thrown a code under the "hybrid battery" option on the code reader. Any suggestions?