Post-crash power loss on climb - regen/HV battery issue?

Just an update/closure in case anybody runs into issues like this . . . it seems that the radiator was the issue. Finally took it to Toyota and had them drain and fill the radiator -- still bubbles in the coolant despite two tries by the body shop. Installed an Optima battery, too, just to be sure (my readings on the original battery were somewhat low).

Haven't had any issues since. One pink battery reading occurrence at 8000 feet plunging up and down hills, but has had no issues in the last year.