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Simplest 3S or 4S lithium ion protection circuit?

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    #41
    Re: Simplest 3S or 4S lithium ion protection circuit?

    Too expensive

    I don't think I'd pay more than a buck or so for dead packs, and less than that prorated for questionable individual cells (on the order of a dime or so.)

    So I'm cheap... next?

    Comment


      #42
      Re: Simplest 3S or 4S lithium ion protection circuit?

      Yes you are real cheap but if see something like that I will PM you about it
      9 PC LCD Monitor
      6 LCD Flat Screen TV
      30 Desk Top Switching Power Supply
      10 Battery Charger Switching Power Supply for Power Tool
      6 18v Lithium Battery Power Boards for Tool Battery Packs
      1 XBox 360 Switching Power Supply and M Board
      25 Servo Drives 220/460 3 Phase
      6 De-soldering Station Switching Power Supply 1 Power Supply
      1 Dell Mother Board
      15 Computer Power Supply
      1 HP Printer Supply & Control Board * lighting finished it *


      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
      2 Hem Saw Computer Stack Board

      All of these had CAPs POOF
      All of the mosfet that are taken out by bad caps

      Comment


        #43
        Re: Simplest 3S or 4S lithium ion protection circuit?

        Hey, if people can get people to "recycle" their old battery packs for free, why can't I join in the fun? :-p

        Comment


          #44
          Re: Simplest 3S or 4S lithium ion protection circuit?

          You might find this USB charging board interesting

          https://www.ebay.com/itm/5V-1A-USB-3...53.m2749.l2649


          I bought some to try out

          I will post the results after I do some testing
          9 PC LCD Monitor
          6 LCD Flat Screen TV
          30 Desk Top Switching Power Supply
          10 Battery Charger Switching Power Supply for Power Tool
          6 18v Lithium Battery Power Boards for Tool Battery Packs
          1 XBox 360 Switching Power Supply and M Board
          25 Servo Drives 220/460 3 Phase
          6 De-soldering Station Switching Power Supply 1 Power Supply
          1 Dell Mother Board
          15 Computer Power Supply
          1 HP Printer Supply & Control Board * lighting finished it *


          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
          2 Hem Saw Computer Stack Board

          All of these had CAPs POOF
          All of the mosfet that are taken out by bad caps

          Comment


            #45
            Re: Simplest 3S or 4S lithium ion protection circuit?

            Looks like for 1S, and it's limited to 500mA output?

            Comment


              #46
              Re: Simplest 3S or 4S lithium ion protection circuit?

              Originally posted by eccerr0r View Post
              Looks like for 1S, and it's limited to 500mA output?
              If scroll down to the details of the board it says 1 amp unless you charge and discharge at the same time then it is 500ma


              When I test this board I will post the results and let you know what it really is
              9 PC LCD Monitor
              6 LCD Flat Screen TV
              30 Desk Top Switching Power Supply
              10 Battery Charger Switching Power Supply for Power Tool
              6 18v Lithium Battery Power Boards for Tool Battery Packs
              1 XBox 360 Switching Power Supply and M Board
              25 Servo Drives 220/460 3 Phase
              6 De-soldering Station Switching Power Supply 1 Power Supply
              1 Dell Mother Board
              15 Computer Power Supply
              1 HP Printer Supply & Control Board * lighting finished it *


              These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

              1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
              2 Hem Saw Computer Stack Board

              All of these had CAPs POOF
              All of the mosfet that are taken out by bad caps

              Comment


                #47
                Re: Simplest 3S or 4S lithium ion protection circuit?

                500mA doesn't do justice these days... hoping for at least 1A preferably 2 or more...
                Then again 500mA is better than 0, I had a box that shuts off charging when itself is being charged...

                Comment


                  #48
                  Re: Simplest 3S or 4S lithium ion protection circuit?

                  Funny Chinese spec:
                  input Micro USB rated at 5V 0.62A
                  USB output rated at 5V 1A
                  Attached Files
                  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


                    #49
                    Re: Simplest 3S or 4S lithium ion protection circuit?

                    Yeah, it looks like it charges slower than it can discharge?

                    Comment


                      #50
                      Re: Simplest 3S or 4S lithium ion protection circuit?

                      Well here is some results for the USB charging board that I posted earlier

                      The one thing that is nice about this board is that it has a LED that lights when you have a load on it

                      But I think it has a few small problems the first one is that when you charge and have a load on it at the same time the charging current drops down to 350 milliamperes and a load I could not see how many milliamperes it was putting out because my tester was in the way but the board gets warm fast

                      When you have a one amp load the board gets warm fast but it put out one amp
                      When you just have the charger on it only it charges at 500 milliamperes and board is some what warm but nothing to worry about

                      So in the end results are if you keep the load under 750 milliamperes you might be alright
                      If you do not try to charge and have a very big load on it you might be alright

                      Is worth the money I paid for maybe depending on how and what I want to use it for

                      If I use it on non name brand batteries and not put a heavy load and do not care how long it takes to charge and do not want to spend a lot of money on test of concept yeah this fits the bill
                      Last edited by sam_sam_sam; 12-15-2019, 09:10 PM.
                      9 PC LCD Monitor
                      6 LCD Flat Screen TV
                      30 Desk Top Switching Power Supply
                      10 Battery Charger Switching Power Supply for Power Tool
                      6 18v Lithium Battery Power Boards for Tool Battery Packs
                      1 XBox 360 Switching Power Supply and M Board
                      25 Servo Drives 220/460 3 Phase
                      6 De-soldering Station Switching Power Supply 1 Power Supply
                      1 Dell Mother Board
                      15 Computer Power Supply
                      1 HP Printer Supply & Control Board * lighting finished it *


                      These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                      1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                      2 Hem Saw Computer Stack Board

                      All of these had CAPs POOF
                      All of the mosfet that are taken out by bad caps

                      Comment


                        #51
                        Re: Simplest 3S or 4S lithium ion protection circuit?

                        Do you think a setup like that will become cheaper to build anytime soon?

                        Comment


                          #52
                          Re: Simplest 3S or 4S lithium ion protection circuit?

                          Originally posted by sam_sam_sam View Post
                          This will tell you the status of the batteries that you are working with
                          I found this that you might be interested in

                          https://banggood.app.link/ediAr9t6v2
                          9 PC LCD Monitor
                          6 LCD Flat Screen TV
                          30 Desk Top Switching Power Supply
                          10 Battery Charger Switching Power Supply for Power Tool
                          6 18v Lithium Battery Power Boards for Tool Battery Packs
                          1 XBox 360 Switching Power Supply and M Board
                          25 Servo Drives 220/460 3 Phase
                          6 De-soldering Station Switching Power Supply 1 Power Supply
                          1 Dell Mother Board
                          15 Computer Power Supply
                          1 HP Printer Supply & Control Board * lighting finished it *


                          These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

                          1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
                          2 Hem Saw Computer Stack Board

                          All of these had CAPs POOF
                          All of the mosfet that are taken out by bad caps

                          Comment

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