Sounds like you may have a bad cell and your over all lost some capacity. I cant speak for the Prius system, but I know the Honda IMA system will go to almost 10% of its original capacity before it generates a fault code. In the mean time your mpg suffers and you find it charges more and assists less.
Usually that is from a bad cell and using a grid charger at 350 ma to float the cells helps it along.
When I first saw yout topic I was screaming Enginer PHEV as it can really boost your mpg because of how the Synergy drive system works and you coudl easily double or triple your mpg depending on the size you buy and how far you drive.
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