3pcs Type-C 15W 3A Fast Charge UPS Power Supply / 18650 Lithium Battery Charger Module DC-DC Step Up Booster Converter 5V 9V 12V 5V

Equipped with dual-color LED to show the charging status; the green light remains steady when fully charged, and charging halts automatically. The module features two 18650 battery slots, a universal Micro USB charging port, and direct DC5V input for charging the lithium battery.
Boost circuit: peak power up to 20W, rated power up to 15W, BOST boost circuit, built-in 12A high-current MOS, efficiency up to 96%, module static power consumption 25mA, optional 5V/9V/12V output. (Load normal recommendation <15W.
Output 5V: Current 3A;
Output 9V: Current 1.6A;
Output 12V: Current 1.2A )
UPS function: When the power supply is active, it directly powers the load through the boost circuit while also charging the lithium battery. If the power is interrupted, the battery path automatically activates to supply the load via the boost circuit. The 5V charging power source used by individual users employs an output capacitor with a larger capacitance value. This capacitor can continue to discharge after the power supply is turned off, causing the supply voltage to decline slowly, which may prevent the board from switching to battery power quickly after shutdown. If you encounter this situation, you can attach a discharge resistor of about 1K at the 5V input port