Lithium Battery Charger Module 1A for single 3.7v Lithium cell.
This TP4056 1A Li-Ion Battery Charging Board type C USB with Current Protection is a tiny module, perfect for charging single cell 3.7V 1 Ah or higher lithium-ion (Li-Ion) cells such as 16550s that don't have their own protection circuit. Based on the TP4056 charger IC and DW01 battery protection IC this module will offer 1A charge current then cut off when finished.
Furthermore, when the battery voltage drops below 2.4V the protection IC will switch the load off to protect the cell from running at too low of a voltage and also protects against over-voltage and reverse polarity connection .
 
USING THE MODULE:
Connect USB cable for power, or 5V DC to pads marked IN+ and IN- on the left-hand side of the module
Connect cell to charge to B+/B- pads on the right-hand side of the module.
A load (something for the battery to power) can be connected to the OUT+/OUT- pads on the right-hand side
Important! Disconnect load when charging
The red LED indicates charging in progress, green LED indicates charging has finished.
Never charge your battery at a rate greater than 1C.