How to Make a 12v Battery Charger

Hey! everyone My name is Steve .

Today i'm going to show you How to Make 12v Battery Charge

With this charge you can charge any type of 12 v battery even your car battery

it is very necessary in cold days because battery drains out very quickly .

This Charger features 2 step Charging 1. Constant Current 2. Constant Voltage

it is very safe and stable for daily use "it's very standard "

Click Here to See The Video

Click here to see the new video

Let's Start

Step 1: Stuff I Used

• Dc to Dc Step Down Converter - click
• Alligator Clip - click
• Multi-meter - click
• Laptop charger

Dc to Dc Step Down Converter

• it's will convert 19 volts from your charger to 14 volts to charge the battery
• it'll provide constant voltage and constant current. ( very necessary )
• it comes with 3 indicators led (red, blue and green) red show constant current blue show load and green show constant voltage "full charge"

Features

• Input voltage range:6-38 VDC (Note: input voltage not exceeding 38V)
• Output voltage range:1.25-36VDC adjustable
• Output current: 0-5A
• Output power: 75W
• High efficiency up to 96%
• Built in thermal shutdown function
• Built in current limit function
• Built in output short protection function

Step 2: Prepare the Adapter

Follow the Steps

1. Cut down the jack of the adapter
2. Remove the outer shield with a blade (Carefully)
3. you'll see 2 wire red and black , black is negative and red is positive (see the image)

Step 3: Connection

You can see the label over the board

• The red wire of adapter will go to "IN+" positive of the board (see the image)
• The black wire of adapter will go to "IN-" negative of the board
• tight the screw terminal with a screw driver

Now connect alligator clip

• Red alligator clip wire will go to "OUT+" Positive of the Board (see the image)
• Black alligator clip wire will go to "OUT-" Negative of the Board

Step 4: Configuration

Now you need a multi-meter to set it up

• Plug the power to the adapter
• Connect the black alligator clip to negative lead of multi-meter and red alligator clip to positive lead
• you can see 2 Potentiometer over the board (see the image)
• first one is voltage and second one is current
• Now select the DC voltage reading on your multi-meter and turn the Potentiometer with a screw driver until you get 14 volts reading on multi-meter
• Now select the Current Reading on your multi-meter and turn the second Potentiometer with a screw driver until you get 2 amps reading on multi-meter (you can go up to 5 amps all it depend upon the battery capacity if you have a bigger battery "like a car battery you can go up to 5 amps "

Step 5: You Are Good to Go

Just plug the red alligator clip to positive of the battery and black alligator clip to negative of the battery

and plug the power to the adapter

You'll see blue led will glow there it means it is charging If you see green led glows after some time it means the battery is fully charged

If You see Red led with Blue led that means it is in constant current charging

Click Here to See The Video

Enjoy

Thank you for visiting my Instructables

Stay tuned for next Projects

Comments

[zoltan.topa]

TO220 3 pin case pb137 perfect up to 1.5 A.

[mechrekt]

I bought two of these modules but didnt worked for me. I only see green light when connected to battery.

[Yusuf Ginnah]

Hi there, i know I'm a little late with this answer but just to let you know that these simple battery charger indicator circuits aren't really intelligent. They work using a comparative measure of the voltage of your charger against the voltage at the battery. I did in fact have one of this design where the led indicator showed green as soon as it was connected to the battery, before I had even switched on the charger. The logic being used that once the battery has a voltage equal to or greater than the charger, it is fully charged. So my charger, was reading any voltage off the battery which was higher than the zero volts coming off an unplugged charger,
Hope it helps
Cheers, Yusuf G

[RamenB1]

This is a 3.7-volt battery charger. It will work or not? can you tell me, please

https://electronicshelpcare.net/how-to-make-3-7-volt-battery-charger/.

[EricE2]

Can I make battery charger with a power wheel charger??

[angasawanjalatan01]

What computer did the chip come out of

[KennyK30]

I wonder can we put digital voltmeter ammeter at output for cleary view and another thing is can we add a fan at laptop charger input as cooling purpose?

[stevetob67]

You can buy these modules that have a screen built in. I have a few of them myself. Checking model numbers, one has ZK-DP60 another is ZK-J5X V2. There are a lot on eBay that are decent quality and worth checking out.

[pemazzei]

Hi, vey nice article and battery charger! I need a 24V - 2 amp charger. What are the mods to get this voltage? Thanks, Paulo, from Brazil.

[stevetob67]

It's exactly the same as above, just make sure to use a 28v or greater power supply and set the voltage to about 26v and the same amperage as above.
Always use a multimeter to check voltage and current before hooking up to any battery.

[marulanantham]

Afternoon, can someone help me please. I need an off the shelf item(s) to do the following:

Running voltage operates at 12V:
LoadExternal DC SupplyBatteryONONCharge if requiredONOFFDischargingOFFONCharge if required

The load needs a constant voltage. The item also requires the appropriate under/over voltage protection, indicator lights etc.

[gt350mk]

Hello,
Great work up and inexpensive way to charge batteries. I have an absorbed glass mat battery, Redtop from Optima. I believe when it is fully charged it puts out 16 volts even though it states it is a 12 volt battery with 720 AH. Will your step down charger charge this battery? Will your charger set-up charge AGM batteries.

Thank you,
Marc Kay

[lucky_duck]

Most batteries require an unstable (cyclic) charging rate or the battery will develop Dendritic growth and self discharge. How does your charger avoid this issue?

[MartinR231]

You are correct lead-acid cells have to have a cyclic charge and not a steady charge...once lead-acid batteries are charged without the benefit of cyclic charging..over time they will self discharge /not hold a charge at all.

[Mr_raja]

Bro i need charger for 6v battery

[OptimisticPessimist]

I'm surprised @instructables let this fly for so long...

[msameer39]

Excellent bro

[laith mohamed]

I must make one , thank you for sharing .

[RodrigoR126]

Can I have this plugged all the time charging the battery and also an arduino plugged on this battery acting as a nobreak for my arduino?

[SerhiiB1]

You can use a 12V light bulb if you don't have a DC to DC converter.