Replaced 2 modules in hybrid battery P0A80

Reset the car by disconnecting the 12v negative for a few seconds

 

Load test the individual modules with 100 amp load tester. Voltage should drop to between 6.0-6.5 instantly, then hold steady above 6.0. If it drops quickly below that the module is bad.

 

Welcome to whack-a-mole! This is what swapping out bad modules, w/o putting each module through a discharge/charge cycle, ideally three times, will give you. Most experience very short term fix of hours/days/weeks/months, before repeating the cycle. Unfortunately, you still have modules of questionable quality; thus the need for a load test as pointed out earlier.

The grid charger is intended for a functioning HV Pack, not one that has gone bad like yours, or a functioning HV Pack in a Prius that sits, unused, for prolonged periods.

Read this to understand what is involved to rebuild a pack for better longevity:
Gen II Prius Individual Battery Module Replacement | PriusChat

Is this the original HV Pack? If so, your pack has the greatest longevity, mileage wise, so far.

You also need mini VCI. Get the cheapest mini VCI from Amazon/eBay. Software version doesn't really matter, as you can find a more current version online somewhere if you plan to work on very late model Toyotas. All the people/companies selling the hacked miniVCI cable & software, are probably coming from the same one, two, or three producers in China; so it really does not matter who on eBay/Amazon you buy from. That being said, probably best to buy one from a seller who has a better reputation.

Read this for more information on setting up Techstream software and using the miniVCI cable. It also contains a link for a 64bit OS (Operating System) set-up.
TundraTalk.net - Toyota Tundra Discussion Forum - View Single Post - Offical TechStream software thread( settings and such)

If you are a Mac user, I hear you have to have software for the Mac that will run a Microsoft Windows emulator, which will allow Techstream software to run.

Whatever laptop you install this hacked copy of Techstream on, this should be a spare junker laptop to be only used for Toyota diagnosis. Assume the software has malware on it tracking all your keystrokes and reporting to some criminal organization trying to steal your identity/financial information; definitely do not use this laptop on websites that require log-in/password entries (email, banking, etc). Given this warning, the many Prius gurus here have had no problems/issues using the hacked Techstream software.