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Powerful lead-acid battery charger for gentle and safer. The charger starts in constant-current operation (constant current mode). If a cell voltage of approx. 2.37 V is reached, the timer and the charger switches over to constant voltage operation (Boost mode). After an hour switches the charger to trickle charging (standby mode). This decreases the voltage to the charging end voltage (2.3 V/Z). In this standby mode flow only a few mA. If the cell voltage, for example, by connecting an external load falls down under a certain value, the charging process starts again.This text is machine translated.