2009 check engine , hybrid battery lights came and gone 2 weeks

Yes be concerned. It does not throw that code for nothing. There's probably alot of corrosion on the internal battery system interconnect and we are seeing reports of corrosion on the ecu plug socket also.

So start thinking about getting that battery serviced or at the very least take the cover off it and see how bad its corroded.

 

I just had a hv battery fail and coded p0a80. This is a 2010 battery from my 2005 car. I removed the battery and noticed a very slight voltage difference in the failing block module (module in block 10). Although the voltage still shows the module as being good, when it's in the car, the car will pick up the voltage difference from the weaker module and throw a failing code.

The car still would work with this module and occasionally throw the triangle, but I would rather switch it out as it will eventually fail completely