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Home >> BMW >> 2015 >> 528i >> Repair and Diagnosis (Single Page) >> General Information >> OEM General Information >> Functional Description - F10 - Charging System, Anti-Theft System, Body Electrical System >> Charging System - Functional Description >> Intelligent battery sensor and battery >> Notes for Service department

Notes for Service department

General notes 

The following general information is provided:

NOTE: Charging and trickle charging of the battery

The battery may only be recharged with a battery charger that has been approved by BMW and that has a constant charging voltage of 14.8V. If possible, the battery temperature should be between 15 °C and 25 °C during charging. Under these preconditions, the battery is adequately charged when the charge current drops below 2.5 amps. If the charging procedure is carried out at low temperatures, it should not be ended until the charge current drops below 1.5 A. If the battery is to be charged while it is still installed, it must be charges using the jump start terminal points. Only then can you be sure that charging is correctly recognized by the vehicle electronics on vehicles with an intelligent battery sensor (IBS). If the battery is charged directly at the battery terminals, this could lead to a misinterpretation of the battery condition and even unwanted Check Control messages or fault entries. The cigarette lighter gets his voltage supply by the front power distribution box via the switched terminal 30B. After terminal 30B off, the relay de-energizes. This means that a trickle charger connected at the cigarette lighter would be disconnected from the battery. Only charge the battery via the jump start terminal point.

NOTE: Trickle charging of the battery for stored or stationary vehicles

In the case of stored or stationary vehicles the battery must be recharged at regular intervals in order to avoid a total discharge and thus damage. See the following document: Battery charging calendar and battery tag.

NOTE: Determining the state of charge after replacement of the IBS or the battery

After replacement of the battery and registration of the battery exchange or after replacement of the intelligent battery sensor (IBS) the vehicle must be in rest state for at least 3 hours: Only then can the new state of charge be determined by open-circuit voltage measurement.

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