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A Dead Battery Charger Was Brought Back to Life

By on June 18, 2022
battery charger repair

A guy on the electrical wheel chair brought this charger for repair. I fixed this charger for this guy about one month ago but at that time the repair was just a loose wire that took me a few seconds to fix but this time it was a challenging fault that I had to do a lot of research to get it fixed. Here is the story.

lead acid battery charger repair

As I said before this charger was working just fine till the customer tried to charge another wheel chair with it; he plugged it in, a loud noise was heard and the charger was not powering on any more.

how to fix a broken battery charger

After I took the charger apart and right away I spotted the fault.

A diode (SR260) was shorted on the output section of this charger and next to it a part number K72 that was blown as well.

how to fix a broken battery charger

sr260 datasheet

Please click here to access the SR260 Diode Datasheet

There was no problem locating the Diode part but the X72 was not known to me at that time. I checked on line and found no answer or any kind of information about it. I consulted Mr. Jestine and he informed me that it could be a resettable fuse but the name part could be different.

The part number is X72 which I found later that it is a PTC that goes up to 75 volts and it is a sort of protection for that circuit.  A big thanks and appreciation to you MR Jestine for the help provided.

how to fix a broken battery charger

I installed the two blown parts and I powered it on through an amp limiter. AS seen in the photo, the red LED came on and that what it should be.

lead acid battery charger fix

According to the charger specs, when powering on the device, the charger should give 24 volts on standby. When plugging the output plug into the car battery, I should get the two red lights (sometime orange) on which an indication that it is charging. When the charging is done, the charging light should go off and switch to green which means that the charging is done.

The guy on the wheel chair came by the shop and I powered on the charger, plugged into the chair battery and it was working fine. Sorry, I was not allowed to take a picture at this time because the customer did not allow me and I respected his wish.

I was so happy to help this guy out. My son in the shop was watching me trying to communicate with this guy (the customer can hear out and understand me but he does not speak) and whispered in my ears not to charge this man the repair fees. Hearing this from my own 12 years old son was just super amazing and that was my biggest blessings ever.

Mission accomplished.

waleed Rishmawi

This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.

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Note: You can check his previous article on A CD Player With F61 Fault Repaired. Panasonic SA-AK18



  1. Parasuraman S

    June 18, 2022 at 10:25 am

    Mission accomplished with million blessings, initiated by your smart son! Great family, indeed!

    • Waleed Rishmawi

      June 18, 2022 at 4:06 pm

      Parasuraman: yes, I am a very proud dad. have a blessed day

  2. Anwar Shiekh

    June 18, 2022 at 11:07 am

    You have taught your son well; reason to be very proud.

    • Waleed Rishmawi

      June 18, 2022 at 4:07 pm

      Anwar: yes, indeed. I am a very proud dad. have a blessed day

  3. Kiptoo Cheruiyot

    June 18, 2022 at 11:53 am

    That was a very nice article Mr Waleed.

    • Waleed Rishmawi

      June 18, 2022 at 4:07 pm

      Kiptoo: I thank you very much and have a blessed day

  4. Paris Azis

    June 18, 2022 at 3:23 pm

    Good job, Waleed! (But the doubled congratulations go to your son)!! Please convey to him my greetings and best wishes for a successful and happly life. God bless you both (and all the members of of your family as well)!

    • Waleed Rishmawi

      June 18, 2022 at 4:09 pm

      Paris: thanks man. I already have. thanks man. I appreciate your comments. I am a very proud dad. have a blessed day

  5. Albert van Bemmelen

    June 18, 2022 at 3:48 pm

    Even if you afterwards decided to only charge for the replacement parts, you still could have only charged half of what it did cost you? But knowing the odd but clear parable in the Bible of the shrewd manager which explains that whoever can be trusted with very little can also be trusted with much it is a very good thing you did!

    • Waleed Rishmawi

      June 20, 2022 at 4:32 pm

      Albert: I thank you and appreciate you comments. have a blessed day

  6. Babu M S

    June 18, 2022 at 11:21 pm

    You have brought your son as broad mind. May god bless your whole family for this kind of act.

    • Waleed Rishmawi

      June 20, 2022 at 4:38 pm

      Babu: everyday my son never stop to amaze me. I am so blessed to have him in my life. thanks for your comment and have a blessed day

  7. Imoudu.O

    June 19, 2022 at 12:31 am

    I think our colleagues have said it all,have a nice day

    • Waleed Rishmawi

      June 20, 2022 at 4:39 pm

      Imoudu: thanks man and have a blessed day

  8. Menahem Yachad

    June 19, 2022 at 2:06 pm


    Excellent job!
    Chargers are a challenge, as I well know!


  9. Waleed Rishmawi

    June 20, 2022 at 4:40 pm

    Menahem: yes they are and parts very hard to find. have a blessed day

  10. Yogesh Panchal

    June 21, 2022 at 4:25 pm

    Give & take is the rule of nature but our growth in such a well mannered environment will teach us when to give & when to take god bless you all......

    Simple way to find out MOV & thermistor.....
    MOV is always connected in mains 240V AC input between Line to Neutral in parallel & thermistor is always connected In Series like Fuse in primary section input.

    This type of resettable fuse is majorly used by Multi port CCTV Camera SMPS.

    • Waleed Rishmawi

      June 23, 2022 at 3:05 pm

      Yogesh: yes indeed my friend. I appreciate you comments and have a blessed day.


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