Lithium-Ion Cells Charger Using Dead Laptop Batteries ...

Discussion in 'The Projects Forum' started by battery.13v, May 9, 2016.

  1. battery.13v

    Thread Starter New Member

    Dec 20, 2015
    So Hi everyone ... i want to make a lithium-ion charger using the laptop batteries circuit boards ... but i searched the internet and i did'nt find any information cocerning this porject ... i'm a beginner and most the ICs in the circuit board don't have Datasheets in the Internet so i want to know :
    1- How a laptop charge the battery in details please ... how much voltage enter in the circuit board ?
    2- How the circuit board charge this cells and how could i control it's charging ... like if i want to charge just 2 cells or 16 cells you see !!
    and Thx A lot for your help !​

  2. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    I never really every seen a setup like that cause the computer language need for the charger circuit cost a couple hundred bucks or so .. I would look at the Nitecore D4 charger and be done
  3. Dodgydave

    Distinguished Member

    Jun 22, 2012
    Laptop cells are usually 18650 type, 3.7v per cell and use battery monitoring pcbs to check the condition of each of the series cells upto 4.2v.
  4. tcmtech

    Well-Known Member

    Nov 4, 2013
    You will be much further ahead to buya standard off the shelf LiPo battery charge balance board assy rather than try to hack a laptop unit.

    The aftermarket units are mass produced and cheap so all you need to do is determine the number of cells you want to charge in series and find a suitable charge balancer.

    eBay and Amazon would be my first two sugetions on where to look.