12 V battery charger

Posted on Dec 20, 2012

This circuit is a high performance charger for gelled electrolyte lead-acid batteries. Charger quickly recharges battery and shuts off at full charge. Initially, charging current is limited to 2A. As the battery voltage rises, current to the battery decreases, and when the current has decreased to 150 mA, the charger switches to a lower float voltage preventing overcharge. When the start switch is pushed, the output of the charger goes to 14 V. As the battery approaches full charge, the charging current decreases and the output voltage is reduced from 14 V to about 12

12 V battery charger
Click here to download the full size of the above Circuit.

5 V terminating the charging. Transistor Ql then lights the LED as a visual indication of full charge.

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