{"title":"Adafruit bq25185 USB / DC / Solar Lithium Ion/Polymer charger","handle":"adafruit-bq25185-usb-dc-solar-lithium-ion-polymer-charger","url":"/products/adafruit-bq25185-usb-dc-solar-lithium-ion-polymer-charger","description":"The Adafruit bq25185 Charger is a versatile LiPo/LiIon/LiFePO4 charging board that supports USB, DC, and solar power input. It is an excellent upgrade from MCP73833 or MCP73831-based chargers, offering multi-chemistry support, adjustable charge rates, smart power path management, and near-MPPT solar optimisation.\n\nConnect your battery to the JST PH 2-pin port, charge via USB-C or DC/solar input, and draw power from the regulated load output (up to 4.5V max). The smart power path prioritises external power while sending excess current to the battery, extending battery life and allowing up to 3A current spikes from battery to load.\n\nKey Features\n\n\nUSB Type-C Input – 5V at up to 1A with 5.1k CC resistors for universal compatibility\n\nDC/Solar Input – 5–18V via side pads with near-MPPT solar optimisation\n\nAdjustable Charge Rate – 1A (default), 500 mA, or 250 mA via onboard jumpers\n\nMulti-Chemistry Support – LiPo/LiIon (4.2V max) or LiFePO4 (3.65V max) via jumper selection\n\nSmart Power Path – Prioritises external power with up to 3A battery-to-load spikes\n\nRegulated Load Output – Up to 4.5V max (ranges from 3.0V at low battery to 4.5V with external power)\n\nThermistor Support – Cut the TH trace and add a 10K thermistor for temperature-based charge regulation\n\nChip Enable Pin – Disable the charger when needed\n\nMounting Holes – For secure installation\n\n\nStatus LEDs\n\n\nOrange – Charging\n\nRed – Fault\n\nGreen – Power good\n\n\nAlso Available\n\n\nbq25185 with 3.3V Buck Board – Same charger with integrated 3.3V regulated output\n\nbq25185 with 5V Boost Board – Same charger with integrated 5V regulated output\n\n\n\nTip: For solar-powered projects, use a 5–7V solar panel. Higher voltage panels will only generate excess heat. Connect via the DC input side pads.\n\n\nIdeal For\n\nPortable battery-powered projects with custom voltage regulation\nSolar-powered IoT devices\nLiFePO4 battery projects requiring adjustable chemistry settings\nReplacing MCP73833/MCP73831 charger setups\n\n\n\nNote: This is the base charger board without an integrated voltage regulator. The load output ranges from 3.0V (low battery) to 4.5V max. If you need a fixed 3.3V or 5V output, consider the buck or boost versions. Battery not included.\n\n\nPackage Contents\n\n1× Adafruit bq25185 USB/DC/Solar Lithium Ion/Polymer Charger Board\n","vendor":"Adafruit","product_type":"","in_stock":true,"options":[],"variants":[{"id":687,"title":"Default Title","sku":"AF-6091","mpn":"ADA6091","price":13.65,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":102,"option1":"Default Title"}]}