Check here. If it’s not here, please add it when you find it.
This is the same issue as living at the top of a hill, charging a full battery, and trying to brake while at ~50.4V.
TLDR: Don’t
Pretty easy to only charge to 50V - prolongs your battery life, cell cycles, etc etc.
It would be interesting to know what kind of extra head room those Pololu regulators have. I’d be shocked if it was fried at 50.01V. They’re definitely higher quality than the super cheap alibaba ones.