Mobile charger as Ni-MH charger

Discussion in 'General Electronics Chat' started by Arup, Apr 13, 2006.

  1. Arup

    Thread Starter New Member

    Apr 13, 2006
    I've a LG mobile phone fast desktop charger lying around with the following ratings
    input 12V, 0.3A
    output 4.2 V 0.5
    it has 3 pins at the output, the battery fits into a slot over it and has a bicolour LED for charge indication (red - charging, green - done)
    the circuit consists of 3 ICs
    K1A494AP - PWM controller
    LM358N - OP AMP
    GMS81C1102 - 8 bit CMOS microcontroller.

    My question is can this charger be used as a Ni-MH charger after modding the output voltage to 1.8/2.0 V.
    also what is the function of the third pin on the charger and the battery?
    Thanks and regards