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Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries

jama1234 56421 15
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  • #1 18221073
    jama1234
    Level 9  
    Posts: 6
    Rate: 9
    Board Language: polish
    Hi
    Have any of you ever converted a drill charger so that it works all the time? I have a Parkside 20V charger, the charger only works when it detects a battery. This works reliably through the voltage difference on the 3 pins. I need to use this charger for another battery, which I converted from Ni-Mh cells to Li-Ion (max voltage 21 V, BMS with load balancer), unfortunately I do not have a charger for it.

    The problem is that I don't know what to connect to this Wednesday pin on the charger to force charging (only 2 wires go to my battery and BMS). I want to make some kind of switch and an extra socket to keep the current mechanism and switch to charging another battery if necessary. How to make the charger give the target voltage? Now when you turn it on, it is in standby mode, it starts charging after connecting the battery dedicated to it.
    Regards
    Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries
    Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries
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  • #2 18221499
    Witek76
    Level 25  
    Posts: 568
    Help: 78
    Rate: 229
    Board Language: polish
    What chips are used in the charger? The picture of the underside of the plate is illegible.
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  • #3 18222485
    jama1234
    Level 9  
    Posts: 6
    Rate: 9
    Board Language: polish
    This is exactly what it looks like:
    Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries
    Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries Modifying Parkside PLG 20 A1 Charger for Continuous Operation with Converted Batteries
  • #4 19257292
    HackoBoy
    Level 11  
    Posts: 22
    Rate: 14
    Hello
    I have the same charger that was more seriously damaged.
    I replaced the transistor with 5n60, abs10 bridge diode, a few more smd resistors, the copper bus between Drain 5n60 and the ferrite transformer. But powered by an electric lamp - the circuit still does not work, and the lamp lights up at maximum. Measure voltave acros there is a small smd element - with the body code q2se does anyone know what this is?

    measure capacitor voltage 47µ/400V = 0V.
    I think the power transistor is constantly unlocked.
  • #5 19593843
    xanderkg
    Level 1  
    Posts: 1
    Rate: 12
    Board Language: german
    Danas sam zamenio Q2SE sa LD7536, i punjač je proradio. Nadam se da će nekome pomoći

    Dodano po 43 [sekunde]:

    Today I replaced the Q2SE with the LD7536, and the charger worked. I hope it will help someone
  • #6 19849346
    ClemAS
    Level 1  
    Posts: 1
    Rate: 3
    Hi @jama1234 ,

    Did you find a solution ?
    I've the same problem.
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  • #7 20016278
    kazikszach
    Level 39  
    Posts: 3990
    Help: 511
    Rate: 1092
    Board Language: polish
    jama1234 wrote:
    Have any of you ever converted a drill charger so that it works all the time? I have a Parkside 20V charger, the charger only works when it detects a battery. This works reliably through the voltage difference on the 3 pins. I need to use this charger for another battery, which I converted from Ni-Mh cells to Li-Ion (max voltage 21 V, BMS with load balancer), unfortunately I do not have a charger for it.

    The charger with the battery communicates with this third pin by means of some series of pulses repeated cyclically, which is rather impossible to cheat.
    Question to my colleague @xanderkg what was the fault before replacing this driver?
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  • #8 20370702
    azaghorth
    Level 8  
    Posts: 41
    Rate: 11
    A charger should be used for the purpose it was built. Makes no point to use it for something else, since it is programmed to behave in a specified manner: e.g: first stage constant voltage, then constant current...etc. Therefore what you will connect at its output, will not work properly.
  • #9 20393509
    jasiek_1953
    Level 11  
    Posts: 26
    Rate: 5
    Board Language: polish
    Hey
    Helpful information. Thanks to the photos posted, I was able to fix the charger.
    I replaced the burnt ABS10 rectifier bridge and the T3.15 A fuse and the charger works :) .
    Thank you and best regards, Jasiek
  • #10 21033992
    olsefb
    Level 1  
    Posts: 1
    Rate: 4
    >>18221073
    Hi. Q5 is a dual P-MOS (usually 4935/4953), trigger it to "on" state or short the DS terminals (PIN 5 to 8 on SO-8 case) so your battery will be always (or when needed) connected to 21VDC, therefore charging constantly. However, consider somehow monitoring the state as overcharging/exceeding the charging time could result in fireworks. Cheers
  • #11 21097303
    diogobreis
    Level 2  
    Posts: 2
    Hello all!!

    Any idea about the PWM driver? on label is written Q2SK.
    Close-up of an integrated circuit with Q2SK marking on a blue background.

    KR
    **Solved**

    Replaced with LD7536
  • #12 21140564
    karol_88
    Level 2  
    Posts: 28
    Rate: 3
    Board Language: polish
    Does anyone know what the U2 IC and transistors Q6, Q11 are?
  • #13 21541929
    silerty45
    Level 1  
    Posts: 1
    >>19593843 Good Morning I have same problem . I change many components , the integrated PWM ic1 QBRG dont work . Thank you . I try to replaced with LD7536. I will tell. Have nice day .
    >>20370702

    Added after 44 [minutes]:

    >>21140564 Hello. Q6, Q11 are BJT-NPN Transistor (hFE=290, Ube=700mV, Ic=6,2mA). About U2, on my PCB mark (9ARF) , it must be a Correction Error Amplifier , like Kia431, or TL431. There no schematic reference to have responce. I just look the pin connection on the PCB.
  • #14 21797975
    bezzinatrevor
    Level 2  
    Posts: 2
    >>21033992
    Can you kindly clarify PIN 5 to 8 on SO-8 case ? as i am trying to fo this modication. I got the pin 5 to 8 bit but what is SO-8 ?
  • #15 21856002
    WALDERAMA 7!
    Level 13  
    Posts: 55
    Help: 3
    Rate: 8
    Board Language: polish
    >>21797975
    @bezzinatrevor Bridge that double MOSFet chip, (pins 5-6 and 7-8 are outs) then You will have constantly output voltage (MOSFet works here as a switch to avoid overload of acu)
    If You use Parkside acus make just a switch ON/OFF to have auto switching charger mode too

    Close-up of a PCB with an SMD IC; red marker indicates a bridge between two pins

    Diagram of dual MOSFET 4953 showing D, G, S symbols and SOP-8 top-view pin assignment
  • #16 21879178
    artoor200sx
    Level 10  
    Posts: 7
    Board Language: polish
    >>21856002
    I have done according to your diagram, but the effect is half-hearted. With no load, 21 volts appears on the pins, while when the battery is connected it only charges it to 17 volts and not a thought more. I read something that the charger has two operating modes, but I don't know how to activate the stronger one.
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Topic summary

✨ The discussion centers on modifying the Parkside PLG 20 A1 20V drill charger to enable continuous operation for charging a custom battery pack converted from Ni-MH to Li-Ion cells (max 21V) with a BMS and load balancer. The charger normally detects the battery via a third pin that communicates through voltage differences and pulse signals, preventing charging without the original battery connected. Attempts to bypass this detection by manipulating the third pin or creating a switch to force charging were explored. Key components identified include a dual P-MOS transistor (Q5, typically 4935/4953) that can be triggered to maintain a constant 21V output, but caution is advised to avoid overcharging. Several users reported hardware faults in the charger, notably with the PWM driver IC labeled Q2SE or Q2SK, which was successfully replaced with an LD7536 PWM controller to restore functionality. Other components discussed include the ABS10 bridge diode, 5N60 transistor, BJT-NPN transistors (Q6, Q11), and a correction error amplifier IC similar to TL431 or KIA431 (marked 9ARF). The consensus is that the charger is designed for specific battery profiles with staged charging (constant voltage then constant current), making it challenging to repurpose for different battery chemistries without risk. Repair and component replacement advice was shared, but no definitive method to fully bypass the battery detection for continuous charging was confirmed.
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FAQ

TL;DR: On the PLG 20 A1, the charge rail is ~21 VDC; "overcharging ... could result in fireworks." This guide helps DIYers repair faults and test continuous output safely on Parkside chargers and converted packs. [Elektroda, olsefb, post #21033992]

Why it matters: It answers how to fix no‑charge faults, identify parts, and understand safe workarounds without bricking packs or chargers.

Quick facts:

Quick Facts

How do I make a Parkside PLG 20 A1 charge continuously?

Locate Q5, a dual P‑MOSFET (often 4935/4953). Force it on or short drain–source by bridging SO‑8 pins 5 and 8. This connects the pack directly to the ~21 VDC rail. Monitor voltage, time, and temperature to prevent damage. "Overcharging ... could result in fireworks." [Elektroda, olsefb, post #21033992]

What does the third/middle pin do, and can I spoof it?

The charger and battery exchange a repeating series of pulses over the third pin. Users report this handshake is required and not easily faked with simple resistors or jumpers. Without it, the charger stays in standby. [Elektroda, kazikszach, post #20016278]

Is it safe to charge a converted Ni‑MH‑to‑Li‑ion pack with this charger?

Not recommended. The charger is programmed for specific packs and profiles (e.g., CC/CV). Mismatched chemistry or BMS behavior may result in improper charging. As one expert warned, "A charger should be used for the purpose it was built." [Elektroda, azaghorth, post #20370702]

What PWM driver is labeled Q2SE/Q2SK/QBRG, and what replacement works?

The primary PWM controller marked Q2SE or Q2SK was replaced successfully with an LD7536. After the swap, the unit resumed operation, confirming compatibility. [Elektroda, diogobreis, post #21097303]

Has swapping to an LD7536 actually revived a dead PLG 20 A1?

Yes. One repair report confirms replacing the Q2SE‑coded device with an LD7536 brought the charger back to life and charging worked. [Elektroda, xanderkg, post #19593843]

My series bulb glows at max and the 47 µF/400 V cap reads 0 V—what does that imply?

That pattern points to a primary‑side fault. A user observed full‑bright lamp behavior with 0 V on the bulk capacitor and suspected the power transistor was continuously on. [Elektroda, HackoBoy, post #19257292]

Which input parts commonly fail on this charger?

Check the ABS10 rectifier bridge and the T3.15 A fuse. Replacing a burnt ABS10 and the fuse restored normal operation for one owner, indicating a frequent failure path. [Elektroda, jasiek_1953, post #20393509]

What exactly is Q5 on this charger’s board?

Q5 is a dual P‑channel MOSFET, typically labeled 4935 or 4953. Bridging its SO‑8 pins 5 and 8 connects the battery directly to the ~21 VDC charge rail, bypassing pack detection. [Elektroda, olsefb, post #21033992]

What are Q6 and Q11, and what specs were observed?

They were reported as small‑signal NPN BJTs. Measured characteristics were hFE≈290, Ube≈700 mV, and Ic≈6.2 mA under test conditions. Choose similar parts if replacements are needed. [Elektroda, silerty45, post #21541929]

What is the U2 IC on the PLG 20 A1 board?

U2, marked “9ARF,” was identified by connections as a TL431‑type reference/error amplifier. This device shapes feedback and regulation in the charger control loop. [Elektroda, silerty45, post #21541929]

Can I use the PLG 20 A1 as a 21 V power source?

For testing, yes—by forcing Q5 on or shorting pins 5–8, the battery sees ~21 VDC continuously. Closely monitor voltage, current, and temperature, and disconnect promptly to avoid pack damage. [Elektroda, olsefb, post #21033992]

How do I force charging for troubleshooting (3‑step)?

  1. Locate Q5 (dual P‑MOS, 4935/4953) on the board.
  2. Bridge Q5 SO‑8 pins 5 and 8 to tie the pack to ~21 VDC.
  3. Watch pack voltage and time; remove the bridge before overcharge risk. [Elektroda, olsefb, post #21033992]
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