How to Make Automatic 12V Lead Acid Battery Charger Circuit Board

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In this video, I will show you how easy it can be to design your own Automatic 12V Lead Acid Battery Charger Circuit Board and have them manufactured professionally at JLCPCB is the largest PCB prototype enterprise in China and a high-tech manufacturer specializing in quick PCB prototype and small-batch PCB production.

You can use this circuit to charge12V 1A ~ 12V 7A Battery.

List of Components:
R1,R3 = 1K
R4,R5 = 1.5K
R6 = 10K
R7 = 1.2K
R2 = 1R5W
PR1 = 50K
Q1 = D882
D1 = 1N4732A
D2,D3,D4 = 1N4007
Relay = 12V
U1 = LM7815
5MM LED = Red,Green,Blue,Yellow
Alligator Clips = 2
Jumper = 1

I designed this circuit to charge your battery @ 70% to 75% only due to some safety reasons. If you want to make it for 100% charging, then remove the LM7815 and connect directly 18VDC supply and set tripping point at 15.8 ~ 16V. and always use 5 to 6 times lower charging current from the maximum value of battery current. i.e 1.2A for a 7AH battery.
*This circuit Has not any current limiting feature.(except 1R5W Resistor)
**This circuit is not 100% Perfect, but it is still very useful for hobby/DIY projects.
***Make it at your own risk.

Circuit Diagram:
PCB Gerber Files:


soldering kit:
Soldering Wire:
Soldering Paste:
Third Hand Tool:
Muktimeter :

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12V 4Amp Battery Charger With Auto Cut Off

In this video i will show you :- 12V 4 Amp Battery Charger With Auto cut off………….. [Over charge protection circuit ]
Simple 12 Volt Automatic Battery Charger Circuit.. This circuit is very simple and you can easily make it at your home……..In this circuit we will use a relay to cut off charging when the battery will be full.
Required components :-
Transistor BC547
Transistor BD140
12V Relay
5K Preset (POT)
Resistor 1K Ohm × 4
Resistor 68K Ohm × 1
Resistor 220 Ohm × 1
Diode 4007 × 1
Zener Diode 3.9V × 1
Vero Board


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How to Make 12V Battery Charger At Home

In This Video I Am Going To Show You How To Make 12 Volt Battery Charger at home.

Required Components

▪ 4700 uF 25V Capacitor (1)
▪ Red LED (1)
▪ 12V 2A Transformer (1)
▪ 1N5408 Diode (x4)
▪ 1 kΩ Resistor (1)
▪ 2 Pin Power Cable (1)
▪ Wire
▪ Plastic Bottle
▪ Soldering Iron
▪ Soldering Wire
▪ Cardboard
▪ Glue Gun
▪ 12 volt battery

Note:- Do not charge low amp batteries.

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Top 5 Best Dual Battery Charger

Top 5 Best Dual Battery Charger

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Low cost |How to make a 12 volt battery charger (1Ah-35Ah) at home

in this video you how to make 12 volts below 35Ah lead acid battery charger using the step-down transformer 1 amp 12v -0- 12v
component are:-
1) 1N4007 diode -4
2) 1000uF/25v capacitor
3)470uF/40v capacitor
4) LM7815 regulator
5) 12v-0-12v,1A transformer
6) 1k ohm resistor
7) LED
this is very quick charger in 4 to 5 hours
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How to make 12V battery charger with auto cut off / 12 volt car battery charger hindi/urdu

Hello Friends in this video i will tell u how to make 12V battery charger with auto cut off this circuit is based on Transister BC547/BC548

Parts List
Transister BC547 , Diode IN4007 2PC, 1k resister 3pc, 4.7k resister 1pc, relay 12v 1pc, 10uf/16v or 25v , VR 10K led red and green,

Circuit Link :-

Simple Diagram :-



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