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Default Replaced hybrid battery still have problems.

I recently had the red triangle come on my 2004 Prius with 115,000 miles. I took it to the dealership and they informed me that the hybrid battery was bad and wanted $3,800 to fix it. I ended up buying a new battery myself and replacing it. After replacing the hybrid battery the car runs fine sometimes, but will suddenly start running as if the battery had gone bad again. I checked the voltages on all the power cells, and they're all 7.8 or higher. I brought it to autozone and the codes it is now reading are, P0A78 Drive Motor "a" inverter performance and P0A1D Hybrid powertrain control module. I do not know where to go from here. I'm not sure if the Inverter is bad now or what. Any help is appreciated.

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