Lithium batteries are charged differently than regular batteries and devices. You’ll need a li-ion charger like this one to charge them. Integrated with the CC/CV charging technology, it is the simplest way to charge a lithium-ion battery. Protection activated in cases of undervoltage, overvoltage and short circuit, which is enough protection for most batteries.

The board has a USB Type-C connector for power, a JST-type connector for batteries, the charging circuit, a protector, and two status LEDs.

• Dimensions: 38 mm x 22 mm
• Max output current: 1 A
• Logic voltage level: 5V
• Operating voltage: 4.5V - 5.5V
• Connectors: USB Type-C (female), JST battery
• Mounting holes: 4

Find Li-ion charger with protection on Soldered website.