6V 4Ah Battery Charger Circuit Design With Automatic Cutoff and Full Charge Voltage

The discussion focuses on designing a 6V 4Ah lead-acid battery charger circuit with automatic cutoff and determining the appropriate terminal voltage at full charge. It is emphasized that charging parameters depend on battery chemistry, with the user confirming a 6V 4Ah lead-acid battery. Recommendations include consulting specific battery datasheets to optimize terminal voltage and charging parameters for battery longevity. One practical approach suggested involves using a 6V AC 1A transformer with a bridge rectifier and an 8-ohm 5W wire-wound resistor in series to limit current, charging the battery for about 8 hours per cycle. Additionally, searching for lead-acid battery charger ICs on DigiKey and reviewing their datasheets and example circuits is advised to select a suitable integrated solution.
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