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Simple Charger for 12V Lead-Acid Batteries

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bountyhunter

Well-Known Member
There seems to be some interest in charging 12V lead acid batteries. I will attach a design I did for smaller lead acid batteries (like 20 A-hr or less capacity) which is an easy project to build. It has temperature compensation so it can be left attached to a battery in the garage (I use it for my motorcycle). It lights an LED when the battery is fully charged. The article explains all the circuit operation.

No heatsinks required, power source is a 12V wall cube.

This info was published in an article I wrote for EDN magazine a long time back so it is public domain now (you can use all you want).
 

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Boncuk

New Member
Hi,

your circuits looks neat and simple.

Here's a neat and simple PCB design for it.
 

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Boncuk

New Member
Very cool. Your PCB software is really fast.:p
It's not the software, it's the operator. :D

BTW, I suggest making a note about the LED types to use. They must be low current (2mA).

Since R12 (full charge) has a value of 3.3K I adapted R15 to have the same value (power LED). All other values are unchanged.
 

MikeMl

Well-Known Member
Most Helpful Member

microtexan

New Member
Battery Charger PCB

It's not the software, it's the operator. :D

BTW, I suggest making a note about the LED types to use. They must be low current (2mA).

Since R12 (full charge) has a value of 3.3K I adapted R15 to have the same value (power LED). All other values are unchanged.
Boncuk, is there a way to print the PCB design without the parts overlay to make an etching pattern?

Thanks
 

Boncuk

New Member
Boncuk, is there a way to print the PCB design without the parts overlay to make an etching pattern?

Thanks
Just PM me your email address to get the Eagle files (schematic + PCB layout)

Regards

Boncuk
 

gie_lostdream

New Member
please,
i'm so confused about "wall transformer"
what is "wall transformer" ?
can someone help me, with schematic diagram of wall transformer..
 

crutschow

Well-Known Member
Most Helpful Member
please,
i'm so confused about "wall transformer"
what is "wall transformer" ?
can someone help me, with schematic diagram of wall transformer..
It's simply a transformer (or more commonly a DC supply) that plugs into a wall AC outlet. Also often called a wall-wart.
 

OlPhart

Member
Battery Maintenance

Here's my flavor. While not as elegant as BHs', its' intent is not to charge but hold a battery over long idle times. Current record is over 2 years on a motorcycle that got parked & forgotten. Carbs were totally plugged, but the AGM battery was fine.

One wall wart & regulator can feed Several diode + resistor outputs (mine has 8). I've build at least 6 of these for friends' motorcycles & garden tractors. <<<)))
 

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gie_lostdream

New Member
Here's my flavor. While not as elegant as BHs', its' intent is not to charge but hold a battery over long idle times. Current record is over 2 years on a motorcycle that got parked & forgotten. Carbs were totally plugged, but the AGM battery was fine.

One wall wart & regulator can feed Several diode + resistor outputs (mine has 8). I've build at least 6 of these for friends' motorcycles & garden tractors. <<<)))

is this schematic can work for Simple Charger for 12V Lead-Acid Batteries
 
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