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Lead acid battery charger schematic using the famous IC LM 317. The circuit provides the correct voltage to charge the 12v sealed lead acid battery or 12v SLA battery. The charging current can be adjust with 1k potentiometer. This sealed lead acid battery charger circuit is automatic so you don't have to pay attention on the battery to full charge because the circuit automatically shift its function to trickle charge when the battery become full charge. Connect the battery which you want to charge in series with a meter and adjust potentionmeter to get the desired charging current. Use a good heat sink with IC, the input current should be minimum 15V to get 12V output to charge the battery.  Lead Acid Battery Charger Circuit Diagram

Build a Best Automatic 12V Lead Acid Battery Charger Circuit Diagram . This Best Automatic 12V Lead Acid Battery Charger Circuit Diagram will charge any 12V lead acid battery including flooded, gel and AGM. It is fully automatic and will charge at a rate up to about 4A until the battery voltage reaches a preset point at which it will switch to a very low current float charge.  If the battery voltage drops again the charger will begin charging until the voltage once again reaches the cut off point. In this way it can be left connected to a battery indefinitely to maintain full charge without causing damage. An LED indicates when the battery is fully charged. Sourced By Circuitsstream  Automatic 12V Lead Acid Battery Charger Circuit Diagram  Commponents Part Total Qty. Description Substitutions R1, R3 2 330 Ohm 1/4W Resistor R2 1 100 Ohm 1/4W Pot R4, R5, R7, R8 4 82 Ohm 2W Resistor R6 1 100 Ohm 1/4W Resistor R9 1 1K 1/4W Resistor C1 1 220uF 25V Electrolytic Capacitor D1 1 ...

Some of you might wonder why a charger is needed at all, to charge a 12 Volt battery from a 12 Volt source! Well, firstly the "12 Volt" source will typically vary anywhere from 11 Volt to 15 Volt, and then a battery needs a controlled charge current and voltage, which cannot result from connecting it directly to a voltage source. The charger described here is intended for charging small 12 Volt lead acid batteries, such as the gelled or AGM batteries of capacities between about 2 and 10 Ah, using a car's electrical system as power source, regardless of whether the car engine is running or not. I built this charger many years ago, I think I was still in school back then. On request of a reader of my web site, I'm publishing it now, despite being a rather crude circuit. It works, it is uncritical to build, and uses only easy-to-find parts, so it has something in its favor. The downside is mainly the low efficiency: This charger wastes about as much power as it puts into...