Modding a ni-mh PSU/charger

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • madan1
    Badcaps Veteran
    • Nov 2016
    • 682
    • Bulgaria

    #1

    Modding a ni-mh PSU/charger

    Hi everyone.
    Is there a way I can mod an original de-walt DE9119 ni-mh battery charger so that it can work with a 4s li-ion bms battery? I guess as is it will not work ( haven't tried it tho ), but basically I want to know if I can tap in and get DC 18-35V from it so that I can use one of those aliexpress dc-dc step-down converter boards with V and C control.
    Here are are the schematics of the charger ( see attached ).
    I do not know what type of PSU is this but does not look like any of the smps I've seen/fixed.

    p.s. I'm adding the datasheet of the IC... which seems to be a microcontroller.. the damn thing starts to look too smart for my needs.
    Attached Files
    Last edited by madan1; 01-06-2020, 03:03 PM.
  • madan1
    Badcaps Veteran
    • Nov 2016
    • 682
    • Bulgaria

    #2
    Re: Modding a ni-mh PSU/charger

    update - without load it outputs 50Vdc. I don't have a sufficient resistor or other suitable load, so could not test it further.
    For now I have put a dc-dc converter board inside, set it to 16.85-16.9V and 1.6A max, connected it to he battery terminals ( the + is isolated from the rest of the board ) and an old 19V 3.5A recapped laptop PSU on the input side.
    Haven't drained the drill battery yet, but at 16Vbat the current is something like 0.3-0.4A. At about ~16.6v, the converter board indicates that the battery is charged, but continues to output 0.15A.

    Still, would like to get rid of the extra psu and use the internal circuitry to supply the charging board
    Last edited by madan1; 01-06-2020, 10:46 PM.

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30991
      • Albion

      #3
      Re: Modding a ni-mh PSU/charger

      if the batterys are 18v then just buy a cheap ryobi charger and mod the holder or re-case the board.

      some company's sell the chargers for very cheap to encourage people to buy more batteries.

      Comment

      • madan1
        Badcaps Veteran
        • Nov 2016
        • 682
        • Bulgaria

        #4
        Re: Modding a ni-mh PSU/charger

        Originally posted by stj
        if the batterys are 18v then just buy a cheap ryobi charger and mod the holder or re-case the board.

        some company's sell the chargers for very cheap to encourage people to buy more batteries.
        the battery consists of 4x 18650 cells and a 4s bms board similar to this one

        I prefer to use the original charger ( or at least its case ) because it is more comfy just to plug the battery in.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30991
          • Albion

          #5
          Re: Modding a ni-mh PSU/charger

          well you could bring the terminals out of the case into something like this:
          https://www.banggood.com/IMAX-B6-Min...p-1202402.html

          Comment

          • madan1
            Badcaps Veteran
            • Nov 2016
            • 682
            • Bulgaria

            #6
            Re: Modding a ni-mh PSU/charger

            Originally posted by stj
            well you could bring the terminals out of the case into something like this:
            https://www.banggood.com/IMAX-B6-Min...p-1202402.html
            Sure, I could, but costs money, while the laptop PSU is free and the dc converter/charger board is less than a yankee dollar. Also, I'm trying to keep the setup as close to stock as possible... I cannot be bothered explaining people how to use a complicated battery charger. Now one only has to plug the battery in the original charger and wait until the green light starts glowing... and another good thing - the extra psu still fits perfectly in the drill case... but of course it would be better if there were no extra external modules and everything was inside the original charger.

            Comment

            • sam_sam_sam
              Badcaps Legend
              • Jul 2011
              • 6037
              • USA

              #7
              Re: Modding a ni-mh PSU/charger

              Originally posted by madan1
              I prefer to use the original charger ( or at least its case ) because it is more comfy just to plug the battery in.
              You can BUT you have to use the temperature sensor that was on the battery pack that was there or it will NOT work correctly

              You also need to make sure that the BMS protection board that you are using work correctly or could have real big problems ( battery bursting in flames or not charging or over charging )


              You need to make sure it works correctly a few times and that you get the exact same results each time

              I highly recommend doing this if you have not work with this type of batteries before and even if you have work this type of batteries before I still do this anyway

              If you are careless with this type of batteries you might get hurt or burn your house or work shop or shed down I have had some unexpected issues before my self working with these type of batteries

              So bottom line please be careful when working with type of batteries

              I have a grease gun at work that has nicad batteries in it and I am also going to use li-ion batteries
              But I doing it differently I going to use the battery charger that comes with the battery pack and use the case that is for the grease gun and just modify it so I can use it

              I will show some pictures of it when I have finished doing this mod
              Last edited by sam_sam_sam; 01-12-2020, 03:23 PM.

              Comment

              Related Topics

              Collapse

              • flat-earther
                ASUS X54H laptop thinks it's always charging even with charger unplugged
                by flat-earther
                The charging indicator light on my ASUS X54H laptop is always on even when the charger is disconnected.

                Windows also shows ''Plugged in'' when charger is not connected.

                This problem started year ago gradually, when unplugging the charger the charging light took several seconds to disappear, then minutes, and now almost always on even when unplugged for an entire day.
                Strangely, before sometimes immediately when plugging in the charger the charging light went away, and later came back with it connected.
                If I let battery run out and say it has 3% Windows will...
                06-24-2025, 09:32 AM
              • motormayhem
                Lenovo T460 Only Charges on One Charger
                by motormayhem
                Laptop Question
                Hello,
                I'm working on a Lenovo T460 that has been having trouble charging as of late. Its worked well since I've owned it for a few years. When I went to use it the other day it was dead and wouldn't turn on (was sitting on an Anker 65W GaN charger). After some fiddling with the charger I got it to turn on and start charging, but seemed like the charger was not working as it should (took a few plug and unplug cycles to get it to start charging).

                A day later it was dead again and wouldn't boot/charge no matter what I did. No lights or anything when...
                05-12-2023, 01:46 PM
              • Document Archive
                ISL88739AHRZ ISL88739 Laptop Battery Charger Datasheet
                by Document Archive
                The ISL88739 & ISL88739AHRZ are a highly versatile combo battery charger
                configurable for operating as either a Hybrid Power Boost (HPB)
                charger or a Narrow VDC (NVDC) charger, supporting 2-, 3-, or
                4-cell batteries. Both configurations allow the battery to work with
                the adapter together to supply the system load when it exceeds
                the adapter capability, referred to as system Turbo mode. HPB
                charger configuration reverse-boosts battery energy to the system
                bus to help the adapter provide the system power in Turbo mode.
                NVDC charger configuration...
                11-05-2024, 03:28 PM
              • xeejem
                NIMH quick charger no power
                by xeejem
                Hope everyone is doing well here. I have been troubleshooting on why my charger isn't giving any charge. At the TNY IC, I did a volt test on pin 2 with closest capacitor ground lead and it is giving 0 volt. Pin 4 and ground is giving around 2v. The capacitor is getting 160v from what I can tell. Those big diodes are tested on board. I don't find any shorts. Do you know how else I can find the culprit? Please bare with my lack of skills....
                08-29-2024, 04:54 PM
              • Johndill
                Dell Inspiron 7567 LA-D993P odd charger issue
                by Johndill
                Hi, I have a Dell Inspiron 7567 LA-D993P that I've just got running.
                There was corrosion around PU1503 which shorted PC1518 & blew PL1504. (Reference pictures attached)
                I've replaced PC1518 & PL1504 & the laptop is now running however I now have another issue.

                Here are the tested scenarios:

                1. With the laptop running on battery, I plug in the 150W charger & the charger shuts off (no LED, protection mode) but the laptop remains running on battery.

                2. With the laptop off, plug in charger (LED says on) & the front charging...
                11-16-2022, 10:55 PM
              • Loading...
              • No more items.
              Working...