Im having a problem when using a TP4056 to charge a single cell 18650 3.7v li ion battery.
I have a solar panel charging. A single cell battery. Powering a wemos d1 mini pro.
The charger largely works fine, and the low voltage cut off works.
But when the battery gets fully charged 4.2v the charger cuts off like you’d expect, the red led goes blue to indicate this.
But as the battery drops the led stays blue and the charger doesn't kick back in until i put my hand over the solar panel to stop the charging then remove my hand and and the red led comes on. The blue light would just stay on draining the battery until i stop and start the charging again.
Could it just be a faulty board?