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How To Revive Any Dead Phone Battery

By on August 25, 2020
how to repair battery pack









I am having old Samsung Mobile phone which is not in use since long time. I am not using it frequently because of its Memory Limitation having only 768 MB usable and it can’t hold much App. Load also.

 One day while organizing my tool drawer I have removed everything out and got this mobile in my hand.

With curiosity I have pressed the power button but it does not get start. So I connected charger but no symptoms of life. Obvious reason if you do not charge battery for a long time it definitely gets drained. So I checked battery voltage it shows me 1.2V out of 3.8V this voltages are very less to start the mobile.

how to repair phone battery

So planned to buy new Battery but due to covid limitation not able to arrange one.

Hence I decide to do some R & D on this problem. Long back i have heard the word “Jump Start” the Battery but not familiar with the process so contacted one of my friend who is in Mobile repair business he guided me to try the process……..

Here you have to take care about Voltage. Battery voltage it should be equal or higher then bad battery by maximum 2V. Here ampere is a factor because here we are injecting Current for jump start. For these types of battery from 750mAh to 1500mAh you can use battery 4V to 4.5V with 1500mAH to 2000mah for injecting current.

samsung battery pack repair

I took one Li-ion Battery 18650 (3.7V) which I have salvaged from old laptop damaged Battery pack. I already have single cell charger to charge this battery & I am using this batteries frequently for testing electronics parts.

I have removed the mobile battery and connect this battery to 18650 batteries in parallel i.e. Negative to negative and positive to positive. Leave the batteries connected for between 10 to 60 seconds or just long enough for your cell phone battery to get little warm. Monitor the temperature and time closely.

how to check phone battery voltage

As soon as the battery becomes warm, disconnect the batteries immediately.

“DO NOT try to fully charge your cell phone battery this way” or it will blast.

 (Place the battery into your phone. You may need to charge the battery the rest of the way as normal, then try to power on the phone.)

After Jump start process I have checked battery voltage it shows 3.40V .i.e. enough voltage to start this Mobile phone.

Now Mobile Start with Battery…………..

how to fix samsung phone battery

Saved one more device from going to scrap

This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

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Note: You can check his previous repair articles in the link below:




  1. Parasuraman S

    August 25, 2020 at 11:32 am

    Excellent idea! Easy way to restart a dead battery! Thanks for sharing!

    • Yogesh Panchal

      August 26, 2020 at 4:37 pm

      Your Welcome! Sir

  2. Albert van Bemmelen

    August 25, 2020 at 12:34 pm

    Very useful article! Li-ion battery to the rescue. Could be a lifesaver if we immediately need our phone to work in an emergency! Even if the original battery pack no longer can be used, the 18650 probably will work too as long as we do not use the phone to re-charge it. (because the third battery contact of the phone is no longer connected with the li-ion that only has 2 contacts).

    • Yogesh Panchal

      August 26, 2020 at 4:40 pm


      You can salvage this 18650 battery form dead laptop Battery pack free of cost.

  3. Henrique J. G. Ulbrich

    August 26, 2020 at 12:19 am

    Excellent, Yogesh. I´ll try with some batteries forgotten in my drawer. I have some doubts:
    1) some of my batteries are sleeping for many months, so I´m afraid they will not come to life again;
    2) Instead of a battery in good charging conditions as you used, would it be possible to use a power supply (obviously set to a voltage not higher than the 2 V you mentioned)? In this case, do you have an idea of the current rate?

    • Yogesh Panchal

      August 26, 2020 at 4:46 pm

      Henrique J. G. Ulbrich,

      1) Try it if works you have nothing to loss.
      2) Try it with at least 1.5 to 3amp Amp this is only for 10 to 30sec. if your battery gets Hot immediately tun "OFF" the power supply and try to charging from the original charger.

      • Henrique J. G. Ulbrich

        August 26, 2020 at 11:02 pm

        Many thanks, Yogesh. Helped a lot.

  4. Waleed Rishmawi

    August 26, 2020 at 1:41 am

    Very interesting article. Thanks for sharing

  5. Yogesh Panchal

    August 26, 2020 at 4:47 pm

    Welcome! waleed

  6. Humberto

    August 27, 2020 at 1:02 pm

    You could save your old Mobile. Cograts.

  7. Fernando Martibez

    May 13, 2021 at 6:52 am

    Excelent Work, Thank's


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