Powers off when sleep occurs after battery replacement

Hi, all -

I just replaced the battery in my MB Air 2013 with iFixit’s battery. Installation was a snap and I did the calibration procedure without issues. Appropriate info including charge and current show up in the System Information screen.

Problem now is that when the laptop is left alone for a while, it powers off. When it’s brought back up, the battery percentage is still in the mid 90’s. This is new behavior; I tried changing power saver and sleep settings without effect. Any ideas?

Thanks!