{"title":"USB / DC / Solar Lithium Ion/Polymer charger [v2]","handle":"usb-dc-solar-lithium-ion-polymer-charger-v2","url":"/products/usb-dc-solar-lithium-ion-polymer-charger-v2","description":"This versatile LiIon/LiPo battery charger accepts power from three sources: a 6 V solar panel (via 2.1 mm DC jack), USB Mini-B, or a 5 V DC adapter. It features automatic charging current tracking that draws the maximum possible current from a solar panel in any light condition, providing near-MPPT (Maximum Power Point Tracking) performance without the cost of a buck converter.\n\nThe charger includes smart load sharing, which automatically uses input power when available to prevent the battery from constantly cycling between charging and discharging. A dedicated LOAD output port lets you power your project while simultaneously charging the battery.\n\nKey Features\n\n\nTriple Input – Charge via 6 V solar panel, USB Mini-B, or 5 V DC adapter\n\nAutomatic Current Tracking – Draws maximum current from solar panels in any light condition\n\nSmart Load Sharing – Powers your project from input when available, preserving battery life\n\nAdjustable Charge Rate – Set for 500 mA by default, adjustable from 50 mA to 1 A via resistor\n\nThree Status LEDs – Power good, charging, and done indicators\n\nLow Battery Indicator – LED output triggers at 3.1 V\n\nTemperature Monitoring – Solder in a 10 kΩ NTC thermistor (not included) for battery temperature protection\n\nJST Connectors – 2-pin JST for both BATT and LOAD ports\n\n\nSpecifications\n\n\nBattery Chemistry – 3.7 V / 4.2 V Lithium Ion or Lithium Polymer\n\nInput Sources – 5–6 V DC, USB Mini-B, or 6 V solar panel\n\nDefault Charge Rate – 500 mA (adjustable 50 mA – 1 A)\n\nLow Battery Threshold – 3.1 V\n\nDC Jack – 2.1 mm barrel jack\n\n\nPackage Contents\n\n1× Assembled charger board\n1× 2-pin JST cable\n1× Stabilisation capacitor (must be installed in your finished project)\n\n\n\nWarning: For use with 3.7 V/4.2 V LiIon/LiPo batteries only. Other batteries may have different voltage, chemistry, or polarity. Battery and solar panel are not included. A 2.1 mm DC jack adapter cable is required to connect a solar panel. Keep the battery out of direct sunlight during charging.\n\n\nIdeal For\n\nSolar-powered outdoor projects\nPortable battery charging stations\nIoT devices with solar harvesting\nOff-grid electronics prototyping\n\n\nResources\n\nCharger Tutorial & Design Guide\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":7730,"title":"Default Title","sku":"AF-390","price":34.14,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":103,"option1":"Default Title"}]}