BMW Battery Manual pdf
The Battery Works Common Battery Terms Battery Testing Battery Maintainence Battery Replacement Special Battery Systems Closed Circuit Current Draw Testing Review Questions E31 (850i): The dual battery system on the 850i was introduced to handle the higher level of electron- ic technology with increased functions and safety features that were added to the vehicle, as well as the added diagnostic information. Design considerations were made to minimize electrical loads during Key Off and periods of driving with low engine speeds while certain timed operations (e.g. Glove compartment light, courtesy lights and seat heating) were active.
Special testing and charging procedures exist for the dual battery system on the 850i, refer to SIB 61 10 90 and SIB 61 06 91 for specific information. E38 750iL: The dual battery system on the 750iL is necessary due to the addition of the E-CATs. If a single battery system was used, the E-CATs would be provided power from the single battery just after cold engine start-up when the battery is at its lowest capacity. This would increase engine loads due to charging of the single battery and cause an increase in injec- tor “On” time during the cold engine warm-up period, which result in unnecessary tail pipe emissions. Providing separate battery systems for the starting circuit and the vehicle circuits also min- imizes the possibility of a discharged starter battery ensuring reliable engine starting.
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