DC 5V to 4.2V Li-Ion Battery Charger & Discharger Board 500/400/300/200/100mA
Adjustable charging current is more suitable for small battery use. Charging current:default 0.5A, can be set to 0.4/0.3/0.2/0.1A by adjusting the pad on the board. 1 Charging board. Otherwise deal is final.