Check the cycle count in the System Report (Apple Menu > About This Mac > System Report > Power). Apple rates these for 1,000 cycles . Look for "Normal" condition; if it says "Service Recommended," factor in the cost of a replacement.
Many 2015 models suffer from the anti-reflective coating peeling off. Check for splotchy or stained-looking marks on the display. how to buy macbook pro 2015
These Intel-based Macs can run hot. Ask if the fans have been cleaned or the thermal paste replaced recently. 💻 13-inch vs. 15-inch Models How To Check Battery Cycles On MacBook - Full Guide Check the cycle count in the System Report