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In the meantime, another keen follower of this blog Mr.Sandy also requested a similar 12V smart battery charger circuit through comments. Most car chargers are rated for both 6V and 12V batteries, so you should be able to find one that will work for your needs.
NP7-12 - Yuasa
We all know how smart the IC LM317 is and it’s no surprise why this device finds so many applications requiring precise power control. You’ll also want to make sure that the charger you choose is rated for the proper voltage. For a 12V 7Ah battery, you’ll need a charger that has an output of at least 14 volts. Anything less than that and your battery won’t charge properly.The first stage of the multi-stage charge process is the constant current mode where the charging current should limit to a quarter of the battery capacity which is 1.75A for a 7Ah battery. This process continues until the terminal voltage reaches 14.4V (2.40V/cell). Assuming you are using a standard 12v 7.2 Ah lead-acid battery, it will take approximately 8 hours to charge from empty using a 10 Amp charger. If the battery is only partially discharged, the charge time will be correspondingly shorter. How Long Can a 12V 7Ah Battery Last?
7Ah 12V Sealed Lead Acid Battery (AA63) | CEF Challenger 7Ah 12V Sealed Lead Acid Battery (AA63) | CEF
Adjust the base transistor pot such that the LED just starts to glow at 14V. Do these adjustents without the battery connected at the output. The second circuit is also good but is not automatic....is current controlled, though. Let me know your thoughts. Thanks, Swagatam when resistance goes high LED will be off. After 4 hours of charging my battery shows 13.00v. But that charge full LED is off now. Plz help me. However, you should pay close attention to the requirements of your specific SLA battery before choosing a charger. Datasheets/spec sheets can be of great help here because the actual demands may vary slightly depending on the model. The following tested 12V charger circuit schematic was sent to be by "Ali Solar" with a request to share it in this post: Smart 12V Battery Charger CircuitsThe Current Controlled 12V Battery Charger Circuit Using IC LM317 presented here shows how the IC LM317 can be configured using just a couple resistors and an ordinary transformer bridge power supply for charging a 12 volt battery with utmost accuracy. How it Works Hi Vinod, The red LED should not glow all the time and turning the pot should change > the output voltage, without the battery connected. When charging a 12V battery, the amount of current required depends on the type and size of the battery. A lead-acid battery will require more current than a lithium-ion battery. For a lead-acid battery, the minimum recommended charge rate is 10% of the capacity of the battery.
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