Multiple error codes and faulty cell, advice needed

Fix or sell? 2007 with 200,600 miles and hybrid battery replacement (albeit a refurbished battery) 20 months ago. Red triangle and all warning lights that indicate battery failure appeared while out driving last month. Pulled over, disconnected 12V to reset, warning lights gone when car was restarted. Drove car to shop and had the following issues detected: error codes C1241, U0073, U0121, U0123, U0124, U0126, U0293, one battery cell failing and two others potentially failing. Technician recommended battery refurbishment and possible ECU replacement if battery refurbishment doesn't clear all the codes. Still using car to run small errands, and DH has purchased a new EV for commuting. Now debating if we should fix the Prius to use on long road trips (two trips a year, 1600-2000 miles each) or if we should sell it and use the $ (plus savings on property taxes and insurance) to rent a car for the road trips. Car not leaking oil and runs well; only other issue (to our knowledge) is the gas gauge that drops from half a tank to blinking pip in just a few miles.

 

Thanks for the welcome! Have been a fan of PriusChat for years. The other DTCs were for tire pressure monitors (decided to go old school to check the tire pressure rather than pay for replacements) and B1421. The codes were read with an Autel but I don't know the specifics of the software.
Separate from the codes the tech checked the HV battery and detected 1 faulty cell and two potentially bad cells. The car had been a more sluggish than usual when accelerating, with battery charge levels going up and down quickly at times, so the battery problem seemed possible to me. If we could avoid an expensive repair we would be very happy.

 

Thanks for the advice bisco. We don't want to travel in an unreliable car if we don't have to.

 

Thanks for the info strawbrad. Since the car is driving ok, was this a momentary possession or is the computer surrendering to dark forces?How much would it cost to exorcise the demons? It sounds like a job that requires special equipment and mad skills.