Anything else to check before replacing gen3 Hybrid Battery?

180k miles, got the triangle and P0A80 code. Just for kicks I replaced the 12 volt battery, cleaned the EGR sys, intake, throttle body and hybrid fan in case it may be related, yeah yeah I know..wishful thinking. Drove great for ~80 miles now Triangle is back, getting 39mpg, and Dr. Prius voltage differential fluctuates all over the map shows often above .5 and even peaks for a moment to .9. Is there anything else to try before putting in a new hybrid battery? Mild chest pains.

Also, what's a reasonable price for a OEM Toyota Gen 3 battery for a DIY assuming someone will sell it to me.

Thanks!!

 

Thanks for the reply. I had read this and was very interested but decided to go with a more conservative approach with OEM as my kid will be taking it across the country. Have you been using them? Would love to hear feedback on them. I could find literally two feedback reports with users happy with the results. No negative commentary.