Adafruit Universal USB / DC / Solar Lithium Ion/Polymer Charger

DESCRIPTION This charger is the only one you need to keep all your Lithium Polymer (Li - Poly) or Lithium Ion (Li - Ion) rechargeable batteries topped up. No matter the power source at your disposal! The Adafruit Universal USB / DC / Solar Lithium Ion/Polymer Charger can use USB, DC or Solar power, with a wide 5-10V input voltage range! The charger chip is super smart, and will reduce the current draw if the input voltage starts to dip under 4.5V, making it a perfect near-MPPT solar charger that you can use with a wide range of panels. Compared to our earlier, MCP73871-based charger this universal charger has some nice improvements: USB Type C port for modern computers and chargers Up to 1.5A charge rate Up to 10V input voltage, 28V protected Load output is regulated to never be over 4.4V so its safe for 3.3V regulators or 5V boost converters No stabilization capacitor needed (although you can add one if you like!) Same load sharing so that DC/USB/Solar is prioritized over battery power when available, to keep the battery from cycling Power Good LED lets you know that the charger is working Less expensive However... The max load current is 1.5A instead of 1.8A There is no Done LED - when the CHG LED turns off, thats how you know charging is complete This charger is a breeze to use for solar projects: pick up any of our many 3.7V/4.2V Li - Ion batteries, and a 6V solar panel. Plug the battery into the BATT port using a 2-pin JST cable and the solar panel into the DC jack using a 2.1mm adapter cable Put the solar panel outside (and keep the battery out of the sun, it needs to be kept cool!) to start charging. You can power another project at the same time by connecting to the LOAD output port, which will never go above 4.4V. Our detailed tutorial on this charger includes a design document explaining how it all works. For use with Adafruit Lipoly/Li - Ion batteries only! Other batteries may have different voltage, chemistry, polarity or pinout. Comes with an assembled charger board, and bit of header. Features: 3.7V/4.2V Lithium Ion or Lithium Polymer battery charger Charge with 5-10V DC, USB or 6-10V solar panel , can have both USB and DC plugged in at the same time, higher voltage source will be used. Automatic charging current tracking for high efficiency use of any wattage solar panel Use any 6-10V solar panel Two color indicator LEDs - Power good and Charging Set for 1000m - A max charge rate , can be adjusted to 500m - A or 1.5A by soldering closed a jumper Will always draw the most current possible from a solar cell - up to the max charge rate! Smart load sharing automatically uses the input power when available, to keep battery from constantly charging/discharging, up to 1.5A draw. Load output is regulated to no-more-than 4.4V Optional Temperature monitoring of battery by soldering in a 10K NTC thermistor (not included) - suggested for outdoor projects where the battery may get hot (50°C) or cold (0°C).