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Ryobi 20 volt 4 amp hour battery pack failure not charging no power output

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    Ryobi 20 volt 4 amp hour battery pack failure not charging no power output

    I have this type of failure before but not like this

    I was using this battery pack and had run down until it only shows one led lights

    Which is suppose mean that it 25% or less

    I have done this a few times before and the battery would charge back up but not
    this one there is one light on but it will not charge

    So I check each bank of cells and got about 3.67 on each bank the batteries are down on charge but not that low

    When this has happened before it would not charge but you would have power for a short time when you would push the battery test button and go off

    But this one failed weird no output will not charge but you have the battery light on

    It has two mosfets which when I have had them not wanting to charge and have low amp output replacing them it would start working correctly again

    This time I am not sure if this is the same type of failure or not

    Running a battery load testing on each battery bank and see how good these battery are at this point

    Then I will decide weather or not to try to repair this battery pack

    A new battery pack is about $50.00 each when you can find the twin battery pack deal
    Last edited by sam_sam_sam; 05-16-2020, 04:49 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

    #2
    Re: Ryobi 20 volt 4 amp hour battery pack failure not charging no power output

    and the chargers are badly designed!

    Comment


      #3
      Re: Ryobi 20 volt 4 amp hour battery pack failure not charging no power output

      This is true for the most part you have to pay attention to the changer when you first place a battery on it to charge to make sure that it is charging
      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


        #4
        Re: Ryobi 20 volt 4 amp hour battery pack failure not charging no power output

        Originally posted by sam_sam_sam View Post
        Running a battery load testing on each battery bank and see how good these battery are at this point

        Then I will decide weather or not to try to repair this battery pack
        Here are the results of bank one of this battery pack
        1837.5 amp hour for each cell in this bank ( 2 ) cells a loss off at 4.5% of a new cell
        I have gotten 1960 to 2020 on these type of cells before ( not separating battery bank to run test )

        I still have four more banks to test

        I run the test as follows
        Discharge
        Recharge
        Discharge
        Recharge
        Discharge final results

        Test setup
        2.50 volts cutoff for first discharge to see where discharge roll of voltage starts about 3.40 to 3.50 is a little higher than normal results I have seen as low as 3.1 to 3.3 volts

        Charge to 4.20
        Discharge to 3.00 volts
        Charge to 4.20 volts
        Discharge to 3.00 volts
        Last edited by sam_sam_sam; 05-17-2020, 08:57 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


          #5
          Re: Ryobi 20 volt 4 amp hour battery pack failure not charging no power output

          Here is the test results
          Attached Files
          Last edited by sam_sam_sam; 05-19-2020, 03:07 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

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