Amazon.com: A1278 A1322 Battery, POWERWOO MacBook pro Battery Replacement 13 inch Mid 2012 2010 2009 Early 2011 Late 2011, a1278 Battery with 6000mAh 10.95V 65.7Wh - High Performance and Longevity : Electronics
Jigsaw24 Tech Support: How to perform an SMC reset on a Mac notebook - YouTube
Reset SMC in MacOS
hardware - Macbook pro 13" mid-2012 not turning on, no battery leds (battery ok) - Ask Different
SOLVED: MacBook Air mid-2012: Random screen glitches and lockup/crashing - MacBook Air 13" Mid 2012 - iFixit
Battery service Macbook Pro Mid 2012 - Apple Community
MacBook Pro Mid 2012, Keyboard and Trackpad suddenly unrespronsive but react to smc reset : r/mac