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June 30, 2010 AT 12:00 am

NEW PRODUCT – USB LiIon/LiPoly charger – v1.1

Usblipo Lrg

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!

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4 Comments

  1. Neato!

    Two questions though:

    Can a load draw power from the system (Charger/Battery/USB) while the LiPo charger is plugged into USB?

    “Keep the battery connected to the charger and pass power through the additional JST connector using the included cable!”

    This means it can draw power from the battery while the USB is not connected, right?

  2. @jesse – great questions! please post this up in the forums!

  3. Similar question: If a charged battery is attached to the charger, and the charger is disconnected from the power source, can the battery discharge through the charger?

  4. hey everyone, lots of good questions – please post them up in the forums, thanks!

    http://forums.adafruit.com/viewtopic.php?f=19&t=16283

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