Dies as soon as AC adapter removed, despite (seeming) battery charge

Hi all,

Been a bit stumped on this: a few months ago, my MSI GS63VR started dying the moment the AC adapter was removed, despite being fully charged on battery.

I assumed this might be a faulty battery, so just recently replaced and installed, but no change. I’ve attempted to do an MSI battery calibration, but it just powers down the computer the moment I hit go, with no change after restart/recharge.

I’ve been searching high and low, but a bit stumped — would be really grateful if anyone could offer some advice/wisdom/perspective.

thanks a ton!

matthew