toyota prius 2007 hybrid pack issue

i have a Toyota Prius 2007 the red triangle goes on and off after driving it for about 50 miles and wherever i go they say to replace the hybrid pack due to code
P0A80 but i have replaced it 3 times in 3 years ( at shops not dealers )and it keeps coming back i cleaned the hybrid cooling fan i see no other solution than taking it to a junk yard i can't afford to take it to a dealer the cost of the battery is higher than the car price now, any idea will be appreciate it..
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