TP4056 5V 1A 18650 Lithium Battery Charging Board - USB C

Here's the description for the TP4056:

TP4056 1A Lithium Battery Charging Module – Technical Specifications:

Handy Tips for Using the TP4056 1A Lithium Battery Charging Module:

1: This module has three sets of connections — the Micro-USB input (5V power in), the B+/B- pads (battery connection), and the OUT+/OUT- pads (regulated output to your circuit). Always connect your battery to B+/B- and power your project from OUT+/OUT- — never connect your project directly to the battery pads, as the protection circuit is only active on the OUT pads.

2: The onboard DW01A protection IC safeguards your battery against four critical failure modes: overcharging (above 4.2V), over-discharging (below ~2.4V), overcurrent (excessive load), and short circuit. This makes the module safe for use with bare Li-Po and Li-Ion cells that do not have their own internal protection circuit.

3: The charging current is set at 1A by default via a 1.2kΩ resistor (R3) on the board. If your battery capacity is less than 1000mAh, you should reduce the charge current — a general rule is to charge at no more than 1C (1× the battery capacity in amps). For example, a 500mAh battery should be charged at no more than 500mA. Replace R3 with a higher value resistor to reduce the current: 2kΩ = 580mA, 3kΩ = 400mA, 10kΩ = 130mA.

4: The LED indicators tell you the charging status at a glance — a solid Red LED means the battery is actively charging, and a solid Blue or Green LED means charging is complete and the battery is at 4.2V. If both LEDs flash or neither lights up, check that your input voltage is stable and within the 4.5V–5.5V range.

5: This module charges one single cell (3.7V nominal) Li-Ion or Li-Po battery only — it is not suitable for charging multiple cells in series, NiMH, NiCd, or LiFePO4 batteries. The fixed 4.2V charge voltage is incompatible with LiFePO4 cells, which require 3.6V, and using it to charge them will cause damage or fire risk.