18v li-ion battery charger. China make it as simple as it get

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  • tibd
    Senior Member
    • Oct 2014
    • 189
    • Sweden
    #1

    18v li-ion battery charger. China make it as simple as it get

    Hello,
    I got a hand on a 18v li-ion charger for screwdriver, upon disassembling it I got amazed by how simple the circuit board is. But question is is it working or not. I'm not by any mean electrician but would definitely like to get some info. The circuit consists of
    1 S9012 pnp
    1 10k resistor
    1 2.2k resistor
    1 1n4007 diode
    1 red led.

    Can anyone put a circuit with these components to make a working 18v li-ion battery charger??????


    If of any interest I can sure put some pics for the actual charger and its guts.


    Regards
    Tags: None
    • larrymoencurly
      Badcaps Veteran
      • Oct 2004
      • 960
      • USA
      #2
      Re: 18v li-ion battery charger. China make it as simple as it get

      Is it one that stops immediately when the voltage reaches 4.1V per cell? Because otherwise I don't know a simple charger can charge lithiums.

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA
          #3
          Re: 18v li-ion battery charger. China make it as simple as it get

          Originally posted by tibd
          Hello,
          I got a hand on a 18v li-ion charger for screwdriver, upon disassembling it I got amazed by how simple the circuit board is. But question is is it working or not. I'm not by any mean electrician but would definitely like to get some info. The circuit consists of
          1 S9012 pnp
          1 10k resistor
          1 2.2k resistor
          1 1n4007 diode
          1 red led.

          Can anyone put a circuit with these components to make a working 18v li-ion battery charger??????

          If of any interest I can sure put some pics for the actual charger and its guts.


          Regards
          With just those component, I doubt that it is really made for charging the Li-ion batt, or for really charging any batteries properly (may be for low current charging for NiCad). It should have at least Charging management IC.
          http://www.futurlec.com/Transistors/S9012.shtml
          TO-92 0.65W 0.5A!
          Please post pictures.
          Last edited by budm; 04-26-2016, 01:48 PM.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6040
              • USA
              #4
              Re: 18v li-ion battery charger. China make it as simple as it get

              Look at the battery pack cell and see if it has a protection board on it if it does not have one ether put one on it or stop using it

                Comment

                • urbis
                  New Member
                  • Oct 2014
                  • 6
                  • UK
                  #5
                  Re: 18v li-ion battery charger. China make it as simple as it get

                  I assume the battery contains most of the control circuitry.

                    Comment

                    • desert-rat
                      Badcaps Legend
                      • Mar 2014
                      • 4103
                      • USA
                      #6
                      Re: 18v li-ion battery charger. China make it as simple as it get

                      I cut open a lap top battery just for fun. It's had about 6batteries and a board with some i.c.s .
                      P.s. and what look like a thermister burried in the batteries.
                      Last edited by desert-rat; 05-09-2016, 06:26 PM.

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