Chosen Solution

After installing an iFixit replacement battery, (computer worked perfectly) and draining the battery till under 10%, I tried to plug it in to charge (as per the directions) but my MagSafe isn’t lighting up or charging.
I’ve tried a different outlet, checked the MagSafe with a current tester and everything seems ok…. What do I do now? Update (09/17/2020) Also reset NVram and SMC to no avail.

Sounds like the MagSafe connector has failed MacBook Pro 15" Retina (Late 2013-Mid 2015) MagSafe 2 DC-In Board A common issue is damage caused by a knockoff charger!

Please don’t buy a cheap knock off unit as they will damage your system! Get the REAL Apple unit directly from Apple Apple 85W MagSafe 2 Power Adapter (for MacBook Pro with Retina display) ● Don’t Replace Your MacBook Charger With a Cheap Knockoff ● OEM MagSafe Chargers vs Cheap Imposters: Teardown for Truth ● Lacking safety features, cheap MacBook chargers create big sparks « Your issue ● FAKE Magsafe MacBook Chargers on eBay - Watch before buying a Mac Charger