Reviving Goal Zero Yeti Link To Charge My Lithium Starting Batteries

Here's how I modified a repaired a YetiLink 120W power supply originally used for my GoalZero Yeti 3000X Lithium battery bank. At 16V it’s perfect for charging the 4S lithium starting batteries I built for my riding lawnmower and mini dozer. I show each step and my thought process behind it, in an effort to demonstrate how non-engineers can understand, repair, and adapt devices for new uses. Repair covers removal of MOSFETs, capacitors, using an electronic parts tester, reading electrical specifications, hot air and Metcal soldering, desoldering, PCB inspection, and component replacement. Stuff I used: RIGOL Digital Oscilloscope DS1102Z-E (updated version of mine): https://amzn.to/4vRyYOC LCR-T4 Mega328 Electronic Component Parts Tester: https://amzn.to/4czljCW 150A In-Line Power Meter: https://amzn.to/40takFy ISDT BattGo BG-8S Battery Meter: https://amzn.to/3EH8hGs Tenergy TB-6AB Balance Charger Discharger 1S-6S: https://amzn.to/44c0kUc My favorite Multimeter, spec'd by @EEVblog: https://amzn.to/3Aicj67 Hakko CHP-170 Micro Flush Wire Cutters: https://amzn.to/4jKkuZY IDEAL Stripmaster 45-092 Automatic Wire Stripper for #10 to #22 AWG: https://amzn.to/44vuKkz