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Shorted Battery Chargers Repaired And Maintained

By on March 24, 2023
Shorted Battery Chargers Repaired And Maintained








how to fix battery charger

These two battery chargers were brought to my shop for repair. The customer explained that these two exploded on site as an electrician was working on the restaurant electrical system.

how to repair and fix battery charger

It is very obvious what exploded in these chargers but you think this is bad? Take a look on the other one.

fixing battery charger

For some reason this device took more damage but do not let the black burnt marks fool you in such situations.

First clean the components, find out what is bad and what is fine then do the repair

how to fix a broken battery charger

The two devices experience the same thing so if I repair the first one, the other one should be repaired as well. So let the repair begins.

burnt varistor

This is the varistor that exploded on both devices and that was the only wrong thing with both of them.

varistor replacement

I did a lot of cleaning on both devices, fresh solder and added new varistor; different color but same specs for both of these battery chargers.

burnt varistor in smps board

These are images from the other battery charger and it was nasty. (After cleaning).

burnt component in battery charger

On this one the varistor exploded and melted the capacitor nearby but the capacitor was still functional.

I replaced it any way along with a new working varistor.

how to fix a bettery charger with a burnt varistor

I powered one of them through a current limiter and the device came on but the light was flashing. I called the customer and I told him about that and he said that is normal because it does not have a load connected to it.

So both battery chargers were up and running and I called the customer for pick and he was extremely happy with the outcome because as I understood from him these are expensive and cannot be found locally.

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.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous article on A Shorted/Dead Welding Machine Repaired. Model: Apex ACR-180




  1. Parasuraman S

    March 24, 2023 at 9:13 pm

    Yes, double mission accomplished! Well done!

    • Waleed Rishmawi

      March 25, 2023 at 2:32 pm

      Parasuraman: indeed and I was happy with the outcome. have a blessed day

  2. Anwar Shiekh

    March 24, 2023 at 10:39 pm

    What on earth did the electrician do to exceed 230V?

    • Albert van Bemmelen

      March 24, 2023 at 11:29 pm

      I also would ask the same question because these instances apparently seem to happen very frequently in your country according to your previous repairs?

      • Waleed Rishmawi

        March 25, 2023 at 2:35 pm

        Albert: yes it does. I got this kind of faults a lot because of mistakes done with electricians but do not bother to aske what happened. have a blessed day

    • Waleed Rishmawi

      March 25, 2023 at 2:33 pm

      Anwar: I have no idea what he did but he provided me with an income. LOL. have a blessed day

  3. Imoudu.O

    March 25, 2023 at 3:53 am

    Good repair friend,I noticed the inductor coil at EMI circuit is still darken after cleaning,is there no kind of fluid that can clean it without damaging the insulating covering of the copper coil: just wondering!

    • Jim Whalen

      March 25, 2023 at 11:20 am

      yes maybe something like WD-40 oil base.

      • Waleed Rishmawi

        March 31, 2023 at 4:37 pm

        Jim: I never tried that but I do not like to use oil for clean up electronic parts. I usually use that for rusty stuff. have a blessed day

    • Waleed Rishmawi

      March 25, 2023 at 2:37 pm

      Imoudu: thanks man.I cleaned it after all the repair was done on that board. the first cleaning was to see which parts where blown and after the repair, I do a deep cleaning on all the parts. I just use normal alcohol. have a blessed day

  4. Yogesh Panchal

    April 1, 2023 at 12:26 am

    Good fix! Waleed


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