Introduction: What to Do If Charger Doesn't See 18650 Li-ion Battery
What to do if the battery doesn't charge, charger doesn't see the battery for 2 reasons: low voltage on it or triggered thermal protection.
Step 1: Measure the Voltage on the Battery
Step 2: If the Battery Has at Least Some Voltage.The Battery Can Be Put in Parallel With Another Working Battery.
10 seconds will be enough.
Step 3: Еhe Voltage on the Battery Has Increased, Now You Can Try to Put It on Charge.
But if the charger does not react again, the operation must be repeated