How long is yours lasting, and what programs are you using?
Chrome and Zoom at the same time can be a pretty big load. Lots of network activity so the radios are always in use. GPU in the package is running and no DGPU to help. If you use an external monitor this could make it worse. Likely some heat being generated so fans are spinning which are often turned off on a 13 MPB.
Your 15" had considerably more battery capacity (8000 mAh vs 5100 mAh), so not surprised it would last longer under that load.
Damn. Yeah I guess I was just expecting better longevity coming from such an old laptop. I’ll check out alternatives to chrome! Thanks everyone