18650 Battery Charge controller with boost converter for stable output voltage. This unit is ideal to build a UPS for your Arduino or Raspberry Pi.
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Input voltage: 4.5-8V
Output voltage: 4.3-27V
Charging voltage: 4.2V
Charging current: up to 1A
Output current: the maximum 2A
Size: 3.3 x 2.3 x 0.9cm
Connection example, VIN + connect 5V solar panel, BAT + terminal can output 4.2V to charging 3.7V 18650 battery, OUT + side can output an adjustable voltage