Simple Charger for 12V Lead-Acid Batteries

Status
Not open for further replies.
B

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).
 

Attachments

  • BatChrgArticle.PDF
    9.7 KB · Views: 962
  • BatChrgScem.PDF
    19.7 KB · Views: 948
Last edited:
Hi,

your circuits looks neat and simple.

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

Attachments

  • LA-CHARGER.gif
    26.9 KB · Views: 1,104
bountyhunter said:
Very cool. Your PCB software is really fast.
Click to expand...

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

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.
 
Any reason for using 10 1N4148 diodes?? (sorry i didn't download the read the article)
 
Battery Charger PCB


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

Thanks
 
please,
i'm so confused about "wall transformer"
what is "wall transformer" ?
can someone help me, with schematic diagram of wall transformer..
 
gie_lostdream said:
please,
i'm so confused about "wall transformer"
what is "wall transformer" ?
can someone help me, with schematic diagram of wall transformer..
Click to expand...
It's simply a transformer (or more commonly a DC supply) that plugs into a wall AC outlet. Also often called a wall-wart.
 
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. <<<)))
 

Attachments

  • Bat_Maint.jpg
    17.4 KB · Views: 166


is this schematic can work for Simple Charger for 12V Lead-Acid Batteries
 
Last edited:
Status
Not open for further replies.

Similar threads

S
  • Question
Lead acid battery Regenerator (12KW pulse power) DiY - worth a try?
Replies
13
Views
2K
Tony Stewart
S
  • Question
Help onStar Wars Prop Project how to use 12 and 24 illuminated switches with 3 PP3 9v batteries without the batteries burning up
2
Replies
23
Views
4K
Pommie
P
Laptop Lead Repair?
2
Replies
35
Views
4K
TheJay
I
  • Question
Battery Charger with Load Sharing + Current Sensor
Replies
4
Views
2K
iptvbrazar
I
A
Li ion battery charger
Replies
13
Views
2K
avz
A
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…