NEW PRODUCT – USB LiIon/LiPoly charger – v1.1. 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 200mA 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!

• 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)
• 200mA charge current, adjustable up 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
• 0.1″ (2.54mm) pads next to the JST in case you want to use terminal blocks or connect it to a breadboard
• Free 2-pin JST cable included!

Available and shipping now in the Adafruit store, $10.00 (that’s right, only $10.00) !

Please post all TECHNICAL questions up in the forums, thanks!