how to charge 11.1v 4,4ah li-ion battery

Discussion in 'The Projects Forum' started by piranha3380, Jan 26, 2014.

  1. piranha3380

    Thread Starter Member

    May 28, 2013
    30
    3
    heya guys i have a question about an old laptop battery i whant to use in a project, as stated its 11.1 volt whit 6 cells into 3 stages serie/paralel,

    how whould i charge this pack up ? can it be done by a simple wall wart or dos it require regulators and other stuf i dont have ? :D

    anyway every helpfull comment about how to safe charge this pack whould be welcome

    thx in advance
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    I have not tried to charge a lap top battery separately but I think you can by applying proper voltage at it's Vcc and ground.

    The battery has a balancing circuit inbuilt and MOSFET's to switch on and off supplying the necessary low voltages to the laptop. Mostly these pins are not used while charging.

    But I could be wrong
     
  3. piranha3380

    Thread Starter Member

    May 28, 2013
    30
    3
    whel problem being i only got the cells :) so i goda find a way to charge cells directly,
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    Be VERY carefull when charging Li-ion cells.
    Overheating can set them to fire.

    In the following PDF (from page 11 and on) you will find information on the charging of Li-ion cells:
    http://educypedia.karadimov.info/library/f7.pdf

    Bertus
     
  5. piranha3380

    Thread Starter Member

    May 28, 2013
    30
    3
    thx alot :) i know they are dangerous thats why i didnt want to just ''try'' something,
     
  6. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Better buy one from ebay or china
     
  7. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    Unless the battery pack has protection circuitry inside (most do for safety reasons).
     
Loading...