How to Make a 12 Volt Battery Charger 

This year's Nobel prize will come to you!

Quick and easy. Best part is the speed at which it is all delivered. Thank you for being quick with things. Its refreshing.

thankyou!!! finally someone who posts this! i wanted to know for so long but this is amazing!

Thank you so much. Now I can charche my solarpanel batteries in wintertime too. Wow. And so many thanks that you show how to do the connections. Really very good. 👋👋👋👋👋🙋🙋🙋

Thanks for the clear, simple video. We are wanting to run / charge a portable device powered by a 12v, 7A/H AGM battery, from a car cigarette lighter plug, and this looks like the perfect circuit for limiting Amps and Volts to safe levels. My question: Is there a built-in function, or a simple modification for disconnecting the load battery if its voltage should fall below the safe minimum for gel batteries? Some customers will likely take the running device out of their utes into the field and may forget/fail to plug it back into the car in time, thus compromising the battery.

Just made my own homemade charger. Soldering is kinda hard I need to practice lol . Thanks for this video.

You'r presentation is clear and helpful Thank's a lot

Blagodaram za ubavi i korisni soznanija!

Thanks I have 3 old power backup batteries, the charging section is toast so I need some thing to keep them charged, they power my Ham radios when we are out in the field.

Brilliant video and on the basis of that, I purchased an identical module. alas although I wired it up as shown in the video and the laptop adapter was showing 19.5 volts on multimeter. the red and green leds were lit on the module and despite turning the voltage adjuster both ways. it wouldn't change from showing output of only 1.49 volts. I will be returning the module and hopefully the replacement will work as shown. I raise my hat to you sir on a clear and informative video and only wished I could say yes it works for me.

You work as a professional with science, creativity and mind 🧠 👍👍

Just built it... works great.

good charger circuit [Tutorial] DIY - HomeMade - How To Make RC Vaterra toy very simple

very good, now i will try to do it - thank you for showing this great video

Thanks !! This is really Helpful...I will now reuse my UPS battery which was lying idle with me for 4-5 months. Do you have a circuit/process for charging Laptop(20V 2.25Amps) or Mobile (5 Volts 1 Amps). If I can use my UPS battery as a power bank??

Hi. Nice video. Where you get that adaptor intalled to change the voltages values?

Hi Steve A great video thank you. Colin

I have been thinking of doing this, but do you need a "battery charger" or can you just use a power supply if you have a overcharge protection module going AFTER the buck converter?

I have used this exact little switchmode module, they are really good BUT they are destroyed almost instantly if the input voltage is removed while a battery is still connected to the output. The addition of a reverse bias protection diode from the output positive terminal to the input positive diode will protect it.

DON'T YOU JUST LOVE RU-vid. THANKS MATE

Very good, simple and efficient

Bro easy tutorial and easy to follow bro you are amazing

Thank you Steve, I am so happy for your prompt response. Can you pls give me a detailed description of how to accomplish this? I am a novice in this field; but I can fix it if you give me the necessary me guidance especially concerning the installation of a diode. By the way, will this setup require an inverter for the laptop charger to pick up the energy coming from the solar panel? Thank you in advance.

gute Arbeit, Große Hilfe Danke und Grüße aus Germanya :-) Good work, big help thanks and greetings from Germany :-)

Thanks for this wonderful tutorial - can you let me know If i can charge 2 batteries (12V) with the same configurations

I used this to charge my 12 volt battery on my Bluetooth boombox, works perfect. My fuses were blown on my volt meter and didn't work at first. I use a laptop charger putting out 19 volt and connect it to a 2.5 jack and then to the step down board that brings it down to 12 volts that I need. Thanks Steve

very interesting VIDEOS thanks bro

Tinkerer tip: Whenever you need to cut the plug end off a wire, always leave enough wire on the plug just in case you need to splice it back together. At least 2 inches, 4 cm.

Nice video!!! If there’s a device that runs on a 6V 4.5 AH SLA battery, isn’t it possible to take it out and connect the device leads to a 6V AC to DC power source and run the device through an electric outlet without the battery? If so should any consideration be made to the Amps of the adapter to be used or any 6V adapter would work?

Hi great vid! And great to see how you did the setting upTHANKS. I blew my meter in Amp before so were a bit nervous! I want to ask why you leave on cable the "lump" by the plug on charger? Has it any use? Seems a bit in the way. thx

Nice one, Subscribed. Please keep'em comin...

Thanks for the video, I've been wanting to make myself a boom box, and your videos help me.

Thank you great video

Thank you!

Thanks for the great video. I have a question about a similar subject. I live in an area where there is a constant breeze and want to build a small wind generator. I thought it would be nice to charge my phone from this generator. I am new to electronics so if this seems like a silly question I apologize. Since the power being stored from the wind generator would fluctuate with wind speed, would that harm anything you are charging? Sort of like a power surge. Or are there things you can add to avoid such a situation? Thanks

need to ask if the battery is fully charged do u have option to bypass like online UPS

Found two of these in my junk drawer and what to know when using it to power IOT device what does it mean when the blue LED is blinking on the buck booster?

Wow, this is an awesome creative video I had a lot of fun watching it. Thank you for sharing with us! I'm a new here, big like 👍 and stay in touch ❤!

i have two old laptop chargers. I can't wait to order those modules.

Can I connect the battery to the OUT + ,OUT - of DC to DC step down converter directly?

Thank you!!! I will make one vs buy one.

what is exact name of the step up and its amperes and voltage mention so i can try build my own.

Thank You Dear it’s worked 🎉 😊

thank you. you talked!!!!!!! where can I find the thing you was adjusting??

I'll try just been very nice and helpful video

awsome my dear i like you video...

Why not setting Amp to max with DC supply so the charging is faster? I enjoy the video and I have learned a lot from you. Thank you.

Thanks dude !! i have made a boombox 100watt. And i was wondering how to make a battery for it. can you tell me does it heat when it charges , and can i use 18650 battery with it to charge them ?

help, I have a large 24 volt lifepo4 battery in my camper but the camper is 12v /13.8v. should I keep a 12v/13.8/ battery charged with a 24 to 13.8v stepdon or just get a giant 13.8 step-down and have no battery?

Excellent video ! 👍🏻

thanks for your video

Great video!!! Where did you get your battery from or where is a cheap place to get one? Doing a project that involves powering a water jet with a 12v battery.

thanks for you great video can you say me how can i make the module circuit

Can this circuit be used as the power supply of an amplifier i.e 12V 3 amp.

Thanks!!!! ;)

Hi I have the same step down module. When I plug in the battery to charge I still get the red led along with the blue. What does the red LED mean? Obviously I'm doing something wrong because on the video you only get the red when you're short circuiting measuring the Amps and it goes to only blue once you plug the battery

Steve, would you have to set the voltage and current again and again every time you connect or charge?

parabéns pelo seu trabalho

Thanks for the fantastic solution. Please advise for three queries. 1. Does this unit have auto cut off when charged ? 2. Can I use this option with increased voltage to charge a 24V SLA battery also? If so what changes do I need to do? 3. Any tips on how to build a case to put these into a secure charging station?

Thanks for the vid! Although my potentiometers aren't working.. >:(

Hey friend what do you call that device that you connect in order to step down the voltage?

Hey this is a great video what a task is this converter will stop when the The charge is full I want to make sure it's not going to overcharge the battery to make sure there's not gonna be anything dangerous please let me know thank you

Thanks. What the board is that? How can I make it?

Hey. I have a 16 volts 3300MA printer charger. Can i use this without a module?

Very nice and simple video, in fact the device that you have used made the video so simple, from where you have bought it and what price?

Does this module had any heating issues, while charging the 12v lead acid battery?

sir i have question i want to make 36v improvise battery to my scoot?

what about if I want to use that type of battery in my car as a secondary battery to run some accessories, how can charge it in the car?

You can use the Imax b6 multifunction charger for this as well, but if you get the adaptor one, you need to buy 15v 5amp adaptor for this. The b6 charger has protection features that this module does not have.

Very good. Thankyou!!

can i use my dc boost controller without an amp controller just.volt to charged my lead acid battery?

can i charge NiCad batteries with it too? I have a Black and Decker 12v powertool set

Sir can i use 19v monitor adaptor, laptop adaptor price are bery high

Thats a great video. can you help me if I can charger my cell phone with a laptop charger. If can increased upto 5 amps.

Thanks for video

Does the step down converter shown automatically stop charging the battery when its fully charged?

Thank you I was thinking about making one.

WHICH MODULE SHOULD I USE TO PRODUCE MAXIMUM AMPERES , CZ I WANT TO CHARGE BIGGER BATTERY

That is a pretty good idea

Do you use a multimeter directly connect battery measure current without load? 3:11

Perfect video man

Thank you so much brother for giving a great knowledge😊😊

Good video very helpful, im am going to do what you have done, thanks for the information, jfk

3:14 how you manage to measure the current directly connecting to the meter? As I know I have to connect on of the terminal to the circuit via multimeter to the battery or power source. Can I measure the of an ac adapter through directly by connecting to a meter?

How can I protect the battery from overcharge? (For leaving it charging for too much time).

Hi, I see that the specs for this step-down module are input voltage of 1.25-36V. If I want to charge a 12v SLA battery fully, I'd need to use a power supply of somewhere between ~15v and 36v. What would happen if I used a power supply of less than the float voltage of the battery (14v in the case of this video)? Say if I used a power supply of 13.7V (a common 12v wall wart for some home appliances), with this step down converter (set to 14v) on a 12v battery... from my understanding, the battery would charge to the 13.7v (assuming it was previously lower), and the it would automatically 'float' at this voltage because the charger can not supply electricity to the battery anymore because there is no voltage differential? This would mean that the battery would be nearly fully charged, but I would be in no danger of damaging it, correct? I understand it would be more useful to just use a higher voltage power supply, but I'm thinking of how friendly this would be for either charging with whatever is on hand, intermittent solar charging, or in case of user error/ignorance.

what about an overdischarge protection? Excellent video!

hey man great video can this method be used for long term and is it safe?

if i have an 12 volt adapter for a monitor , can i charge my 12v battery directly without a step down converter ?

These low cost, simple switching regulators are brilliant for this kind of job when a DC supply (of the wrong voltage but the right power is available) and I have bought many for many different types of project. Great informational video BUT ... 1. There is simply NO need to cut off the jack plug from the PSU at all. This is plain wasteful and reduces future flexibility. Simply obtain a suitable jack socket and wire THAT to the regulator instead. This means you can keep using your laptop supply ... for other things (e.g. other low cost voltage supplies) if not for supplying your laptop as normal. 2. When using this type of switching regulator one should ALWAYS fit a Schottky diode (or diode pair) between the regulator output and the battery to protect the regulator from probable reverse voltage damage when the mains is deliberately or accidentally disconnected before disconnecting the regulator from the battery. One diode ... a few cents and problem solved, circuit protected. 3. by implementing 1. above, the regulator can also be housed in a plastic weatherproof box together with a low cost voltage or volts/amps display available from eBay or Banggood or others for less than a burger, and can be left connected to a car battery in the car - set the output volts (measured AFTER the Schottky diode) closer to 14.4 volts and the output current limit to 4 or 5 amps for a large, wet tech battery e.g car though. A permanent connection can be made to a dedicated charging socket inside the vehicle cabin ready to just have a laptop supply plugged into it whenever charging is required. No opening the bonnet, no messing with croc clips just plug in, switch on the mains and away to go. Just remember this will NOT provide enough power to start a car, just to recharge the battery over a few HOURS! It's not an instant fix. 4. If you implement 3. above with a volt or volt/amp meter, remember to fit the meter AFTER the output diode otherwise your charge/battery voltage will not show correctly although the amps might (depending on exact meter type and circuit wiring). If you intend to leave it in the vehicle permanently remember to EITHER fit ONE extra lead input to the box - an ignition switched positive feed to the +ve connection on the meter, OR the meter can be connected direct to the incoming supply (voltage permitting) and because of the Schottky diode on the output there will be no power from the battery to power it either.. 5. WHATEVER amps you wish to utilise, ensure the input supply can provide them, but remember though that although a 19v, 4A supply will have almost 80 watts available assuming the regulator is 85% efficient (they usually are, or better) then taking a conservative 80% figure ... 80 Watt x 80% = 64 watts at 14.4 volts = 4.4 A. 85% efficiency gives 4.7A and 90% efficiency gives 5A! How can you get more amps out than in? You are converting ENERGY not voltage so look at the power IN compared to the power OUT multiplied by the expected (or measured) efficiency of the regulator. 6. Finally, if you want to be able to charge OTHER types of batteries (e.g. rechargeable electric drill batteries, then simply replacing the two on-board trim pots with the same value panel mounted ones will allow you to set both Volts AND current EXTERNALLY so that your supply can be set for constant volts (lead-acid charging) OR constant current (NiCd or NiMh) but be wary of using it to charge Lion or LiPo batteries/cells due to their much more complex charging criteria. For 18 volt batteries you'll almost certainly need a higher voltage input than 19v. It MAY be sufficient to use 24v but I'd expect you to require a few more than that even ... say 26 to 28 volts.

Assalamualaikum Bhai protection k lie diode zarori h k nai Ya module protection day ga battery k reverse current sw

can we use this for Lead acid battery ? I asked this question from aliexpress link which you shared , they said it cant used . Any reason ? then didnt tell me the reason

Thanks

I’m just trying to charge a push mower battery do I need the 5 amp step down can’t I use a voltage regulator

thank you!

Is this have auto cutoff as you have said when battery is fully charged green light appears i want to know that it will stop charging battery or not.

Amazing bro

can we use this for Lead acid battery ?

can i use LM2596 step down converter which is without ampere adjustment and ampere is 3max

hi i,m confujed to measure current by short will you please explane is this method for any multymeter ? i have buck converters bu i'm always confuje to set current will you please help me