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USB LiIon/LiPoly charger (v1.2)

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This is a Lithium Ion and Lithium Polymer battery charger based on the MCP73833. It uses a USB mini-B for connection to any computer or 'USB wall adapter'. Charging is performed in three stages: first a preconditioning charge, then a constant-current fast charge and finally a constant-voltage trickle charge to keep the battery topped-up. The fast-charge current is 500mA by default, but is easily adjustable from 100mA up to 1000mA by soldering a through-hole resistor on-board. 

This board is great for DIY projects because it has 3 indicator LEDs - one for power, one for charging status and a third that indicates when charging is complete. Keep the battery connected to the charger and pass power through the additional JST connector using the included cable! 

Battery NOT included.

  • Comes assembled and tested with a free bonus JST cable!
  • 5V input via mini-B USB connector
  • For charging single Lithium Ion/Lithium Polymer 3.7/4.2v batteries (not for older 3.6/4.1v cells)
  • 500mA charge current, adjustable from 100mA to 1000mA by soldering in a resistor
  • Separate JST connectors for battery and load system so batteries don't have to be removed for charging
  • Chip supports a 10K NTC thermistor which we have stuffed as a plain 10K. For people who require temperature monitors (using high charge rates), remove the 10K and solder in the thermistor in its place
  • 0.1" (2.54mm) breakouts for the battery, DC, and status LEDs
  • Free 2-pin JST cable included!



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