Lithium Charging Help!

Discussion in 'The Projects Forum' started by Gordon1, Jul 1, 2008.

  1. Gordon1

    Thread Starter New Member

    Jul 1, 2008

    I am having some problems with a project of mine. I have a space that is 16mm by 50mm by 4mm (LxWxH) that I need to fit a charging circuit in. I am having problems finding a charging circuit for 2 3.7v 400mah li-ion cells in series. they by no means need to be high current, just enough to charge. This Charger has to fit in the above space. My maximum input voltage would be about 5.5v and my maximum current would be about 300ma. But that power is coming from a solar cell 2" by 4" (and I am not expert on solar cells and current ratings of them).
    I have been looking at this one but I can't tell if I need any other components for the actual circuit.
    Basically I am trying to build one of these
    but I am struggling with the low current charger.

    Oh, and everything is in DC by the way.

    Please help me!

    Last edited by a moderator: Jul 1, 2008
  2. nanovate

    Distinguished Member

    May 7, 2007
    That charger is designed for single cell battery packs so you would need additional circuitry
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    You are expecting your solar cell to deliver about three times the power it is able to.:(