2008 hv battery at purple and loss of power on acceleration and shaking

It all started when I noticed I had no power going through the hill's to work which normally would happen if I went up big hill cause the hv battery would go down to purple but would recharge going down the hill but this time it barely recharge then going up a small hill car died abs light came on vcs and triangle light pulled over let and car sit awhile then started again but when accelerater was pushe'd all the way down car would vibrate still lack of power battery will charge slowly when in park but drops down fast with any more then usual acceleration and takes forever to build up unless I baby it I had hv battery replace 20000 miles ago so took it back in where its under warranty the hv battery tested fine and they don't know why it's not charging or when it does why drops so fast they put it another car and it worked fine they also don't know why it has no power and shakes ..only code shows is for the catalytic convertor p0420 I have been burning way more oil then usual for the last 6 months anyone have any idea what this could be and any decent mechanics in Riverside or OC

 

The red triangle turned off right after i turned the car back on

I had it replaced at a placed called battery4pruis they pulled the codes and all they got was the p0420 I'm burning a quart every 2000 miles

222000