This is a Gel Cell Battery Charger Circuit using LM317. It can charge any size of the Gel cell batteries at 300mA or 650mA or 1.3A. This circuit can extend the life of the Gel Cell battery. Because it is a lower voltage charging (adjust the voltage of 13.4V). Thus no overheating. While the circuit is running, the LED indicates charging. And the battery voltage rises and a full current as we setting before. Then, the current-flow decreases to zero. At the same time, the LED will go out. Gel cell battery charger circuit working In the circuit above, We use the LM317 as 1.5A Adjustable Positive Voltage Regulator. It converts the input DC voltage into the stable voltage to

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