One chip NiMH charger?

Discussion in 'General Electronics Chat' started by CVMichael, Jan 3, 2012.

  1. CVMichael

    Thread Starter Senior Member

    Aug 3, 2007
    416
    17
    Is there a one chip easy to use charger that I can set mAmps and voltage to charge?
    I need to charge two, 9V NiMH batteries, 200 mAh each in parallel.
     
  2. Ctenom

    Member

    Nov 1, 2010
    59
    1
    Look at the MAX712, MAX713 i haven't gone though the data sheets myself but they should do the job i think.
     
  3. CVMichael

    Thread Starter Senior Member

    Aug 3, 2007
    416
    17
    Doesn't the fast charge damage the battery in time?
     
  4. Ctenom

    Member

    Nov 1, 2010
    59
    1
    Fast charging can reduce overall battery life yes. im sure you can configure it to charge at what ever current you like. like i said i haven't read the data sheet. all i know is that a 9v rechargable has 7 cells so you need to configure it as such. just read though the data sheet there is bound to be a trickle charge setting. or if you wait a bit im sure someone else will post a better example
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,001
    3,229
    You can't charge them in parallel.

    You can use two separate circuits to charge two batteries or charge one and then switch to the other.
     
  6. CVMichael

    Thread Starter Senior Member

    Aug 3, 2007
    416
    17
    Why not? Isn't it the same as charging one 400 mAh battery?

    I know that NiCd batteries can't be charged in serries or parallel.
     
  7. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    Never parallel connect batteries because it's dangerous. They are never exactly matched so one battery can be forcing current into the other. It's very bad practice.
     
  8. crutschow

    Expert

    Mar 14, 2008
    13,001
    3,229
    Series or parallel are your only two choices so what's left?:rolleyes:
     
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