charger - How do I know if TP4056 charging modules are faulty - Electrical Engineering Stack Exchange
How to Charge a Smartphone With a Broken Charging Port or Faulty Charging Cable
Can someone help diagnose my battery? It's showing full charge based on multimeter when charging but when I unplug it, it drains to 0v. Could 1 faulty battery be causing this issue?
How to Charge a Car Battery: Step-by-Step Guide - Car and Driver