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You are here: Home / Battery Charger Circuits / How to Recharge Dead Batteries

How to Recharge Dead Batteries

Last Updated on May 20, 2026 by Swagatam 12 Comments

In this post I have explained how to recharge and use bad, defective discarded batteries using an innovative battery charging process invented by John Bedini.

Table of Contents
  • Contribution of John Bedini
    • How Bedini SSG Function

Lead acid batteries can sometimes be a problem to get rid of. They can also be high priced to upgrade. In case discarded in the wrong way, they have a tendency to finish up in the land fill up or even rotting of in your junkyard.

Contribution of John Bedini

John Bedini has presented a bequest to the world which can bring back and enrich the used, abandoned, sulfated batteries.

In case your battery is sulfated from typical utilization, it may commonly be recovered using this discovery.

Batteries which have material impairment or have warped plates are worthless. The Bedini SSG (Simplified School Girl) generator can separate the sulfation on the battery plates and energize the batteries. On many occasions, the battery will in fact acquire further voltage, workable power compared to the time it had been purchased.

By means of routine utilization, a battery would probably gradually drop its potential to hold electricity. This can be witnessed by the necessity to charge the battery far sooner every time. Typical battery chargers often give rise to this consequence due to heating effect of the battery.

Because the plates get hot by way of charging, these are steadily weakened. A battery may have less electrical power every time it is utilized.

With the Bedini charger, that is not the situation. I have reconditioned batteries which were found resting around in a trash.

A couple of such batteries that possessed a charge of below 2 volts each presently are running my electric boat generator.

These types of batteries were not consuming a charge with regular chargers. After a while and many rounds with the Bedini charger, the batteries have become superior to brand new.

How Bedini SSG Function

This electric motor would not self start. You need to provide it with a little bit force to pick it up going, however once it begins rotating it is going to turn up by itself and self adjust its very own acceleration and speed depending on the dimensions and charge condition of the batteries getting charged.

Since a magnet moves down the coil, a tiny electric current is stimulated into the main coil.

This activates the transistor to switch on, enabling electricity from the operated battery to stream by way of the supplementary coil.

The magnetic field generated in the secondary coil provides the cycle a tiny lift up on its path past the coil.

As the magnetic field sets off the coil, the transistor is turned back off. This leads to the magnetic field in the supplementary coil to drop (back emf).

During this period, the vibrant electric power makes its way into the process which is emptied via a diode into the batteries to be charged.

This method could be demonstrated to generate additional energy on the recharging aspect compared to the need to steer the motor. In the method presented, the input current amounts between 150-200 mA.

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Filed Under: Battery Charger Circuits, Energy from Magnets and Earth Tagged With: Batteries, Dead, Recharge

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!



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Reader Interactions

Questions & Answers

Total Posts: 12
Newest Oldest
Raj
January 29, 2026 • 6 months ago #199820

Hi. Good day Sir.In the Bendini circuit ,the positive line is connected to the charging battery. Is this correct .

Reply
SwagatamAdmin
January 29, 2026 • 6 months ago #199835

Good Morning Raj,
The positive of the charging battery is connected to the BJT collector via a diode, and its negative is connected to the positive of the primary battery….

Reply
Alinader
March 20, 2025 • 1 year ago #169937

hi sir, good day. i have replicated this device and charges well, especially those old ones. can you design a battery swapper or a simple cap dump circuit implementing a comparator circuit. thank you

Reply
SwagatamAdmin
March 21, 2025 • 1 year ago #170017

Hi Alinader,
I have a related concept in this blog, which can be modified for your application, you can read it here:
https://www.homemade-circuits.com/multiple-battery-charger-using-dump-capacitor/

Reply
Jovan
July 2, 2022 • 4 years ago #131235

Kako da napravim strujno kolo 12, 24, 36, 48 V DC struje da menjam voltažu i da menjam frekfenciju od 500 KHz. Za elektrolizu vode.
Kako da upotrebim struju iz bobine za elektrolizu vode.

Reply
Egay Diolola
May 28, 2022 • 4 years ago #122100

Hi Swagatam,
Can you demonstrate how to make the coil/s using R60 copper coated Lincoln rods. How to make them or I mean how many R60 rods will be used, and its physical appearance after made as a “core” before winding the 850 turns magnet wires on both windings?

Reply
SwagatamAdmin
May 29, 2022 • 4 years ago #122106

Sorry Egay, I do not have the required information regarding how to make R60 copper coated Lincoln rods

Reply
Gopal.K
January 13, 2020 • 7 years ago #74498

How the PH and TDS value of Distilled water affect the Battery life. Can any one explain in detail, with chemical formula.

Reply
Reggie
November 19, 2021 • 5 years ago #105051

If the water has been distilled the TDS will be 0. Pure water is also neutral so the Ph should be 7.

Reply
naser yusoff
June 25, 2015 • 11 years ago #31728

Hi Sir,

Do you happen to have a battery swapper circuit which can be implemented in this Bedini circuit diagram. I have seen your "Twin or Split Battery Charger Circuit ' (https://www.homemade-circuits.com/2014/05/twin-or-split-battery-charger-circuit.html). Can this be integrated with the Bedini circuit diagram . If YES, what modification should be done on this circuit .The aim is to let the motor run without having to physically stop and swap the battery , making it almost overunity unit.

Many thanks in advanced.

Reply
SwagatamAdmin
June 26, 2015 • 11 years ago #31753

….moreover the primary battery never gets discharged according to the theory

Reply
SwagatamAdmin
June 26, 2015 • 11 years ago #31752

Hi Naser,

both the batteries are differently rated so cannot be swapped….the primary battery is any used, discarded, sulphated low AH battery while the other one is a good battery….I don't think swapping the batteries is recommended in the design.

Reply

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