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 14.5 V. As the battery approaches full charge, the charging current decreases and the output voltage is reduced from 14.5 V to about 12.5 V terminating the charging. Transistor Q1 then lights the LED as a visual indication of full charge
Components
Name List Quantity
Op-amp LM310A 1
Transistor 2N2905 1
LM350 1
1uF Capacitors 1
0.1uF Capacitors 1
100p F Capacitors 1
500Ohm Resistors 1
3K Resistors 1
1K Resistors 1
15Ohm Resistors 1
230Ohm Resistors 1
15K Resistors 1
0.2Ohm Resistors 1 Diode 1N457 1
LED 1
Push Button Switch 1
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