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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About two years back, one of the leading software companies in India wanted to generate leads for its software services business. Their target market unlike any company in India was the US Market where dollars glitter.

This was the time when I was looking out for a Job change and through one of the Job Portal's I got connect with this gentleman. I joined them in their sales team without studying their bank balance. The very first day I got to see their balance sheet just to realize that they were running under huge loss for the last couple of years. Even their website was a junk. Every prospect that I talked to complained about the website and never came back.

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Solar boat battery charger, great for marine, or utv atv car or truck I love this!!!

Solar boat utv atv battery charger
I got tired of electric battery chargers and went with a solar panel battery charger for my boat deep cycle battery, it is easy to use I love this
Solar battery charger
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How It Failed: Schumacher XCS15 6-12V 15A battery charger

my charger broke, i fixed it. but i only fixed it back to the bad design it originally had.

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How to make Emergency Mobile Charger with pencil battery

How to charge your mobile phone by using three Pencil Battery Charge mobile without electricity. This is emergency mobile charger. If any disaster happens the whole electric supply may blocks. So if we have batteries we can charge mobile phone with this batteries. Now Kerala facing biggest disaster in this condition electric supply stops in many places. So this video will help them for any emergency.
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Lead acid car battery charger with automatic switch off between 13 and 14,5 volt (schematic)

Sorry: the video stops suddenly due to a low camera battery, but everything was told so far.

Schematic & demo of a lead-acid car battery charger that automatic switches off on the following battery voltages (set with a 3 pole switch): 13,23 Volt / 14,18 Volt / 14,50 Volt. That switch-off voltage depends also on the (use) of a diode to the battery. But surely a safe switch-off voltage can be set, e.g. in the middle position of the switch. After testing with the “computer diode” (barrier voltage 0,6 Volt) the circuit did not want to switch off at the highest voltage (14,5 V). Anyway: it switched off properly at the middle voltage (middle switch position, 14,2 V).

It is not a beginners circuit because you can damage your car battery when you let it switch off on a too high voltage and the aligning to the different voltages must be watched carefully and takes time.

Plus the fact that the resistors that decide about the switch-off are in the (very) low resistance range. So it could be that you must experiment with resistors in the 5-20 Ohm range to precisely get your switch-off moment with lead-acid batteries with slightly different properties, compared to the ones that I used.

By the way: I used 2 different lead-acid car batteries (40 Ah and 75 Ah – 12 Volt) during my experiments and all worked fine, so too much worries are not necessary.

You could get e.g. an old 12 V car battery for free in the dump and do your experiments in the precise aligning process. Of course that battery must be a little bit healthy, with a “dead” lead acid battery it is not possible to align everything properly.

The basic alignment can, by the way, be done without a lead-acid battery connected to the circuit. It can be done by connecting a + voltage (opposite to ground, minus) to the sense-line and very very slowly adding voltages via a separate power supply between 12 V and 15 Volt.

At the same time: connect a Voltmeter with 2 digits behind the comma (so 1/100 Volt) to the sense line (+ opposite to ground, minus) see and align when the Schmitt trigger switches off. When all is OK you will see that the Schmitt Trigger switches on very precise (1/100) voltages in this range (12-15 Volt) and this depends on the setting of the 470 K potentiomer.

Align that 470 K potentiometer carefully (going out off the middle position, slightly up or down) till you find the right 3 voltages where the charger switches off.

By the way: it is not difficult. The circuit works very properly and was thorough tested during the development the past weeks.

Be careful with 110 V or 230 V AC, it can be lethal. Make it impossible that you, during experiments, can touch a 110 V or 230 V wire by isolating all these wires properly with good quality PVC tape (preferred Coroplast tape) and/or blank silicon kit. Use tiewraps to fasten PVC tape isolations, it can slide off.
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Important: you can omit (bridge) the diode to the battery. It will switch off more easily, because the diode gives a voltage drop.
The problem could be that the “charge” led keeps lighting up when the circuit has already switched off.
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How to connect a car battery charger

In this short video I demonstrate how to connect a battery charger. The important thing here is to ensure you are connecting it up to the right terminal. If you get this wrong you could damage the battery and the charger. Enjoy 🙂

Battery charger specification


•Suitable for use with 6V & 12V lead-acid and 12V AGM batteries of 1.2Ah to 120Ah.
•Input : 230V AC 50Hz 0.6A
•Outputs: 6V: 4A DC 12V:4A DC
•Automatic detection of battery voltage & condition
•Automatic charging current selection
•4 charging modes : 12V Standard, AGM & Winter; 6V Standard
•5 step charging including recovery & maintenance cycles
•Memory function automatically re-starts charging if interrupted
•LCD display with battery level indicator & dual colour backlight
•Interchangeable 1.5m battery clip & ring terminal connector leads included
•Overload, reverse-polarity and short circuit protection
•Manufactured to European electrical safety standards
•Suitable for low maintenance and maintenance-free batteries
•Not recommended for use with GEL batteries


Homemade 12V Lead Acid Battery Charger – COMPLETED Version

Finally took the time to finish off my homemade battery charger for 12V lead acid batteries. I took a M.O.T. and stripped out the secondary, and wound roughly 20 turns of 12ga copper wire. 15.2 VDC open circuit. More turns of wire = higher voltage.

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Automatic Car Battery Charger with Pulse Desuphation – Ultimate Speed ULG 3.8 A1

7 mode intelligent charger:

1 – Polarity and damage check
2 – Recharge / Desuphatation
3 – Start charge with maximum current
4 – Charging up to 80%
5 – Absorption – up to 100%
6 – Trickle charge and monitor
7 – Demand recharge

Working Modes (Voltages, Currents and Battery Compatibility):

Mode 1
6V Battery
Charging voltage 7.3V – 0.8 A – Batteries from 1.4 Ah to 14 Ah

Mode 2
12 V Battery
Charging voltage 14.4V – 0.8 A – Batteries from 1.4 Ah to 14 Ah

Mode 3
Charging voltage 14.4V – 3.8 A – Batteries from 14 Ah to 120 Ah

Mode 4
Charging voltage 14.7V – 3.8 A – Cold conditions or AGM Batteries from 14 Ah to 120 Ah

Other specifications:
Working temperature 0-40 degree C
IP65 Dust and Water protected
Power consumption: 60W

Ultimate Speed Brand from Lidl

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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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