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Battery Charger Circuits

3-Step Automatic Fast Battery Charger/Controller Circuit

Last Updated on May 17, 2026 by Swagatam 272 Comments

3stepbatterychargercircuit

Generally it is noticed that while charging batteries people hardly pay any special attention toward the procedures. For them charging a battery is simply connecting any DC supply with matching voltage with the battery terminals. A fast battery charger circuit charges a battery with enhanced speed so that it is charged in less time than the specified period. […]

Filed Under: Battery Charger Circuits Tagged With: Automatic, Battery, Charger, Controller, Fast, Step

Make a Battery Charger in 15 Minutes

Last Updated on May 17, 2026 by Swagatam 92 Comments

easiestbatterychargercircuit

I have posted many battery charger circuits in this site, some are easy to build but less efficient, while some are too sophisticated involving complex construction steps. The one posted here is possibly the easiset with its concept and also is extremely easy to build. In fact if you had all the required material you […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Minutes

Battery Charger Problems Troubleshooting Discussed

Last Updated on May 17, 2026 by Swagatam 14 Comments

battery charger circuit

The included battery charger circuit was designed and built by Mr.Vinod Chandran, however there’s some issues and problems  with the circuit the troubleshooting of the same is addressed in this article. I have explained the discussion between Vinod and me. Discussing a Transistor Battery Charger Problem Vinod: I am attaching the circuit image of the […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Discussed, Problems, Troubleshooting

Selectable 4 Step Low Voltage Battery Cut off Circuit

Last Updated on May 17, 2026 by Swagatam 12 Comments

battery charger circuit

In this post I have explained a circuit configuration which facilitates a multi-step low voltage selection and cut-off for the battery being used and monitored. The circuit was proposed by Mr. Pete. Technical Specifications Dear Swagatam,Your assistance during the past few days has been incredible, thanks to which I think I have managed to get close to […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Selectable, Step, Voltage

Sec Exciter Powered HV Capacitor Charger Circuit

Last Updated on May 17, 2026 by Swagatam 1 Comment

NEW SEC EXCITOR POWERD HV CAP CHARGER WITH HV DC OUTPUT 001

My friend Steven has updated a few more of his findings related to his sec exciter experiment, I have explained more what Mr. Steven has to say. NEW SEC EXCITER POWERED HV CAP CHARGER WITH HV DC OUTPUT Here’s the newest circuit originally it was a 3 piece circuit i found on YouTube so i modified it and upgraded […]

Filed Under: Battery Charger Circuits Tagged With: Capacitor, Charger, Exciter, HV, Powered

Battery Cut Off Charger Circuit Using a Single Relay

Last Updated on May 17, 2026 by Swagatam 31 Comments

simplestbatterychargercircuit

Amazed to hear this! Yep that’s actually possible, you would need only one relay and a handful of diodes to make a simplest one relay automatic battery charger circuit. How it Works The idea struck me while trying to design the easiest possible battery charger circuit for one my clients. The concept is simple; just […]

Filed Under: Battery Charger Circuits Tagged With: Battery, Charger, Relay, Single

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