Excellent & Simple Battery Charger (Gel/Lead Acid/Li-Ion/+ more)

This circuit has been in use for 24 hours a day over the past 4-6 months. It operates perfectly. I used this circuit to charge two 18650 Li-Ion batteries for my cordless vacuum cleaner. You can charge many different battery types with this circuit. If you charge (2) Li-Ion batteries in series as I did, be sure to affix a 3A/ 70-90 degree Celsius thermal fuse between both batteries using thermal heatsink compound and foil tape. The fuse will then be wired in series with the 2 batteries. Also set charger output voltage to 8.33V – 8.36V, and use a 1 ohm resistor in the circuit.

Schematic here:


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9V Alkaline Battery Charging Circuit(Also 1.5v Cells)

Learn how to make a good alkaline battery charger which is NOT likely to cause the batteries to leak or bulge, and will charge them properly. Though alkaline batteries are not intended to be recharged, they do seem to recharge well using this circuit. I put together this circuit from information obtained from the web page below. The circuit shown in the video was designed for 9V batteries, but you can also charge 1.5V (AA/AAA/AAAA)batteries by lowering the power supply voltage. The batteries are charged using low current DC pulses.


Schematic is here:


For fully charged 9V LED indicator circuit:


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auto battery charger circuit using 555(english version)

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Bedini SSG Battery Charger/Desulfator

This circuit uses a 12v battery to charge other 12v batteries to a higher voltage. According to John Bedini, you are getting more out of the circuit than you put into it(Which I have not proven). The high voltage that is created to charge the 12v battery is created by the back EMF from the coil.

Circuit/Schematic located here:


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12V Lead Acid Battery Charger(Homemade)

I took a MOT and carefully stripped out the 2000V Secondary and replaced it with a low voltage high current winding of 18-20T or 12ga wire. New fully rectified DC output is 15.8VDC. An electrolytic capacitor of 1500uf was also added for smoothing purposes(Not much smoothing is required for charging lead acid batteries). Also includes a voltage monitoring circuit which allows you to know when the voltage of the battery being charged has reached completion. A green LED will be brightly illuminated to let you know to unplug the charger.

Schematic Here:

The circuit in the schematic above will connect to this automatic charging cut-off circuit, then to the battery to be charged:

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Automatic 12v battery charger circuit diagram using atx computer power supply

12v battery charger with auto cut-off circuit diagram. Charger circuit with overcharge protection from ATX power supply.
Converting pc power supply to 12v power charger. 13.5v 13.8v to 16v. How to use the atx source as the 12v battery charger circuit that automatically cuts off the power. Can charge the battery from 30A to 100A.
Channel: Alfred


Inductive Battery Charging Circuit (NiMH/NiCd)

Learn how to make a simple inductive battery charger for your NiMH/NiCd rechargeable batteries(2 to 4). The circuit in the video is for charging (2) batteries in series. This circuit operates in a very similar way as an ultrasonic toothbrush charger. The charging rate is slow(25-30mA), which can be made higher if desired, but it does charge well. The toothbrush charger uses a PWM IC to produce the high frequency pulses (75khz) into the primary winding with feedback to adjust the output under load, and this circuit uses a 555 IC to produce 42-46khz pulses into the primary winding to simplify the circuit. The transformerless power supply shown in this video is designed to power the exact circuit shown in this video. If you modify the primary winding and the circuit draws more current, then you will have to modify the transformerless power supply to deliver more current. You can also power the circuit using a very small 12V transformer. Don’t be afraid to experiment with different coils/windings!

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Link to Charger Schematic:


Link to Transformerless Power Supply:



Automatic battery charger circuit breaker

How to automatically cut power when fully charged battery. To do battery charging circuitry automatically disconnected when the battery is full and the indicator light. Guide rechargeable battery diagram lower capacity and a large capacity battery


What Are Circuit Breakers?

Circuit breakers are electrical devices which are used in electrical panels. They monitor and control the amount of electricity that goes through the electrical wiring and are important to make sure that the electrical system of a house or any kind of facility is functioning properly. This is why when there is a circuitry problem, it is vital to check if the circuit breakers are causing it and if they need to be replaced.

Although a lot of individuals today today automatically choose to buy new circuit breakers once they find out that the ones they have need to be replaced, more and more are realizing that buying used breakers might be the better option. This is because used breakers are actually just as good as new ones and are priced a lot cheaper. There are also plenty of places where you can buy them. Many online and offline stores have them and you would usually have a lot of options for the types of used breakers that you can purchase.

You need to remember that it is always advisable to have a licensed electrician, regardless of the level of knowledge you have in breakers and electrical systems, to determine which breakers you need for your home or office, but it would also be helpful to have some knowledge on the types of used breakers that you can buy. Here is a simple guide on the different types of used breakers that you can choose from.

The first type would be low voltage circuit breakers. This type of used breakers is the ones which most homeowners use. These breakers are small and can easily be replaced. They are typically installed inside breaker panels to allow easy access. The smallest type of low voltage circuit breakers would be the miniature circuit breakers or MCBs. MCBs can carry electrical currents below 100 amps and can stand a charge of up to 1000 amps. The low voltage breakers which are most commonly used would have been the molded case circuit breakers or MCCBs that can carry 1000 amps and has the ability to withstand currents up to 10000 amps. These used breakers are considered to be magnetic circuit breakers since they make use of a solenoid which is electromagnetically powered in order to break the circuit in the event that too much power is running through it.

There are also the medium voltage circuit breakers. These used breakers are able to withstand about 1000 to 72000 volts, depending on the model. These are often used by large buildings and facilities and are either installed on the roof in switchboxes that are enclosed or indoors inside cabinets. There are also several varieties of medium voltage circuit breakers and these would be: vacuum, SF6 and air circuit breakers. Vacuum circuit breakers work by maintaining a power arc inside a vacuum. This means that air is allowed back into the breaker once the breaker is tripped, which would then stop the arc. SF6 circuit breakers have a power arc which is generated in a chamber that has sulfur hexaflouride gas. This gas reacts with the presence of a higher-than-average voltage through increasing in density, which then stops the arc. As for the air circuit breakers, they have two spring-loaded contacts which are positioned close together within an air-filled environment. The spring-loaded contacts come apart once the breaker is tripped and this would separate the contacts.

The last type of used breakers that you can purchase would be the high voltage circuit breakers. These would be breakers that are capable to handle over 72500 volts of electricity. These are commonly used outdoors and are installed in chain-link enclosures that are along power lines that carry high voltage electric currents. This type of breakers are operated using a solenoid which, once there is too much power running through it, reacts to fill the chamber where power is flower with a kind of inert material. This inert material can be oil, gas or other inert material which stops the electric current from arcing from a contact on to the next until the circuit breaker is reset.

When buying a used breaker, you need to make sure that you are buying the correct type to avoid any type of accidents or problems. Aside from understanding the different types available, it is also advisable to consult an electrician to be sure that you are getting the right one that you need. You should also check if the breaker has been properly reconditioned and verify if it comes with a warranty. If you are buying from an online merchant, you may want to call their customer service or support department first to ask all of the questions you have regarding the used breakers that they are selling. Through doing all these, you should be able to buy a used breaker that would be able to function properly without having to spend too much money.

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Homemade 12V to 48V DC-DC Converter Battery Charger for Electric Scooter/Bike

This is a PC board I made so I can charge a 48V seal lead acid battery from any 12VDC source. This design is simple and uses an off-the-shelf audio crossover coil. It charges my battery from a 12V source that gets switched on once the sun goes down. In the morning my batteries are ready to go and it didn’t cost me anything. Energy from the sun. However I can use with and 12V source that can provide 2-3 amps of power. There is a special circuit that will stop the SMPS once the battery level low around 11 volts. Next day the sun comes up and charges the 12V battery.