The BAUSER all round controller monitors the remaining capacity of your traction batteries and registers totalising and service hours. The heart of the controller is the BAUSER microprocessor technology and the environmentally friendly data storage by EEPROM. The remaining capacity is clearly visible by a LED display. The single LEDs are active from the right to the left. If the ca- pacity falls under the limit value "prewarning" at type 830 and 830.1 the penultimate red LED will flash. At type 855 and 855.1 the last yellow LED will flash. When reaching the discharge voltage at type 830 and 830.1 the two last red LEDs flashes alternately. At 855 and 855.1 the red LED lights up. Simultaneously a voltage free relay contact would open (i.e. lift lockout). The batteries are therefore safely protected against exhaustive discharge!