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The 1 A LITHIUM BATTERY CHARGING BOARD (2 pcs) is a complete constant-current/constant-voltage linear charger for single cell lithium-ion batteries. Voltage: 4.5 to 5.5 VDC (by on-board USB connector) Charging current: 1 A adjustable Charge accuracy: 1.5 % Charge indicator: green = fully charged, red = charging