Prius won't go into drive with red triangle on

Not sure what this means. What points are you measuring?

 

Update, bought a used battery today, expecting some bad modules. Figured I could use some of the good ones from my old unit for replacement. I found the expected middle 4 were bad, with 1 leaking 5.5v to ground and another .5v. The other 2 had black marks near where they mount indicating a short, yikes. But, my modules don't fit, they are too small. From the pictures I've seen I realize I had a Gen I series pack in the car. Now I need to find 4 more modules . The "new" module is shown in the foreground.

 

Seen my share of leaking packs but that one is quite bad

 

Sorry, meant to mention that this was measured between the + terminal and the oxidized section of the battery.