Hybrid Battery Replacement code P0A80 abnormal behaviour

I have a 3rd generation 2014 Toyota Prius and every so often the code P0A80 Hybrid Battery Replacement code keeps popping up ever so often! I have a obd2 scan tool so i reset the fault code in order for the hybrid system to function! when i perform a reset, it could be weeks till the fault code comes back up again, or it could be days! Time varies!

So I decided to scarp the hybrid battery and perform some checks on the cells! Every cell i got between 8.02 to 8.05 volts! so seemed like they were all good! then i decided to clean the links that connected the cells together and shine them up good! I also cleaned out the cooling fan for the battery!

Mounted everything up and started my car and everything was good for a while, but then it still keeps coming up!

Need help! anyone at all have suggestions based on this experience! would really appreciate some help!