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Analysis (Lamp 3) Testing self-discharge. If self-discharge is too high, charging is discontinued and fault mode is indicated. Maintenance charging - Float (Lamp 4) Charging at constant voltage. Maintenance charging - Pulse (Lamp 4) Charging varies between 95% and 100% state of charge. The battery receives a pulse when the voltage drops and keeps the battery in perfect condition when it is not in use. The charger can be connected for months at a time. The charger continuously measures the termin