Power supply device (1, 1', 100, 100') with battery monitoring, power line connection (2, 2', 702, 702') and several electrochemical power storage packs (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703), whereby each of these power storage packs (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703) has at least two power connections (26, 26', 26", 26"', 26 IV, 26 V, 26 VI, 26 VII), from which the individual power storage packs (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703) are either linked with one another or are electrically connected to the power line connection (2, 2', 702, 702'), whereby the battery monitoring has components or modules by type an electronic monitoring system (4, 104, 104', 604, 604', 704) with a receiver (5, 5', 105, 105', 505) and several measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707) spatially separated from the electronic monitoring system positioned (4, 104, 104', 604, 604', 704), respectively to measure at least one item of measurement information about the status of the power storage pack (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703), and each of the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107"', 107 IV, 107 V, 207, 207', 707) respectively comprises its own measuring device (9, 9', 9", 9"', 9 IV, 9 V, 9 VI, 9 VII, 209, 209') and a transmitter (10, 10', 10", 10"', 10 IV, 110, 110', 210a, 210b), and whereby at least two power storage packs (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703) are respectively allocated their own measuring device (9, 9', 9", 9'", 9 IV, 9 V, 9 VI, 9 VII, 209, 209') and whereby the receiver (5, 5', 105, 105', 505) comprises a demodulator (17, 517, 617), that is connected to lines (15, 15", 115, 115', 215, 415) that are connected to the power line connection (2, 2', 702, 702'), whereby respectively one measuring device (9, 9", 9 IV, 9 V) is only electrically connected respectively to one power storage pack (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703) through a connection (11, 11', 11 ", 11'", 111, 111', 111", 111"', 111 IV, 111 V) and the connection (11, 11', 11 ", 11'", 111, 111', 111", 111'", 111 IV, 111 V) for the respective measuring device (9, 9", 9 IV, 9 V) respectively forms a measuring point (12, 12', 12", 12"') in a single power storage pack (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703), where (12, 12', 12", 12"') an electrical voltage can be measured and whereby each of the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107"', 107 IV, 107 V, 207, 207', 707) also comprises its own microcontroller (8, 8', 8", 8"', 208, 308, 408, 608, 608'), and whereby each transmitter (10, 10', 10", 10"', 10 IV, 110, 110', 210a, 210b) of the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107"', 107 IV, 107 V, 207, 207', 707) has a modulator (16, 16', 16", 16"') controllable by means of the microcontroller (8, 8', 8", 8'", 208, 308, 408, 608, 608') of the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107"', 107 IV, 107 V, 207, 207', 707), whereby at least one modulator (16, 16', 16", 16"') is electrically connected to the power line connection (2, 2', 702, 702') and comprises a unit, by which a signal (419, 719) can be modulated on to the power line connection (2, 2', 702, 702'), whereby in the signal (419, 719), information ascertained by the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107"', 107 IV, 107 V, 207, 207', 707) is encoded, that can be transferred through the power line connection (2, 2', 702, 702'), and whereby the demodulator (17, 517, 617) of the receiver (5, 5', 105, 105', 505) is designed to receive the signal (419, 719) modulated on the power lines (15, 15', 115, 115', 215, 415), so that the receiver (5, 5', 105, 105', 505) can receive and decode the information coming from the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107"', 107 IV, 1 07V, 207, 207', 707), characterised in that the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107'", 107 IV, 107 V, 207, 207', 707) is configured to determine the status of the power storage pack (3, 3', 3", 3"', 103, 103', 103", 103'", 103 IV, 103 V, 203, 403, 503, 703) using a measured voltage, by comparing the measured voltage with a nominal voltage and a deep discharge threshold of the power storage pack (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703), and whereby the measurement electronics (7, 7', 7", 7"', 107, 107', 107", 107"', 107 IV, 107 V, 207, 207', 707) is furthermore configured in phases of increased load of the power storage pack (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703), in particular because of partial damage, a memory effect or an especially strong discharge, to reduce the transmission of data packs (F 1, D 1, D 2, D 3, D 4, D 5) and to interrupt the sending of data packs (F 1, D 1, D 2, D 3, D 4, D 5) in the event of a deep discharge of the power storage pack (3, 3', 3", 3"', 103, 103', 103", 103"', 103 IV, 103 V, 203, 403, 503, 703).