USB / DC / Solar Lithium Ion/Polymer charger - v2
USB / DC / Solar Lithium Ion/Polymer charger - v2USB / DC / Solar Lithium Ion/Polymer charger - v2USB / DC / Solar Lithium Ion/Polymer charger - v2USB / DC / Solar Lithium Ion/Polymer charger -  v2

USB / DC / Solar Lithium Ion/Polymer charger — v2

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NOTE: This product is only designed for use with solar panels sold at the Adafruit store. We cannot guarantee this will work with solar panels purchased elsewhere. Please purchase this kit and panels from Adafruit to ensure optimized functionality!

Make your projects to go green this summer with our specialized USB/Solar Lithium Ion Polymer Battery charger! This charger is a very unique design, perfect for outdoor projects, or DIY iPod chargers. We’ve spent over a year testing and tinkering with this charger to come up with a plug and play solution to charging batteries with the sun and we’re really pleased with what we ended up with.

Easy to use! Pick up any of our many 3.7V/4.2V LiIon 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 terminal block adapter. Put the solar panel outside (and keep the battery out of the sun, it needs to be kept shaded!) to start charging. You can power another project like a Mintyboost at the same time by connecting to the LOAD output port

Our carefully designed charger is designed specifically for solar charging, and will automatically draw the most current possible from the panel in any light condition!

Please note! This isn’t a true MPPT (max power point tracker), but has similar performance. Our detailed tutorial on how to use this charger includes a design document explaining how it all works. Please read all of the documentation before purchasing.

Comes with an assembled charger board, a 2-pin JST cable that will fit into either the BATT or LOAD ports, and a large stabilization capacitor that must be installed in your finished project. Does not come with a Lipoly battery or solar panel but we do have tons available in the shop that work quite well. New! We have updated the design to be a little more compact, have nicer mounting holes, and a 2.1mm DC jack
3.7V/4.2V Lithium Ion or Lithium Polymer battery charger
Charge with 5-6V DC, USB or 6V solar panel!
Too dark out? Use a USB mini-B cable or a 5V DC adapter
Automatic charging current tracking for high efficiency use of any wattage solar panel
Use any 6V solar panel
Three color indicator LEDs — Power good, Charging and Done
Low Battery Indicator (fixed at 3.1V) with LED output
Set for 500mA max charge rate, can be adjusted from 50mA up to 1A by soldering in a resistor
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
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).

Board / Layout & Schematic files on Github