i know you dont need a bmw battery in the car, the bosch one in it matches just fine.supposedly the battery is charged different based on its life. if you have a newer battery it is charged differently than an older one. the ecu must be programed to understand this.
2ndly, i have already gotten an radio from another car, the display does the same thing.
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-- TiAg -- Blacklines, Matte Grills, Euro Switch, Solaris Bulbs, M Shifter & E-brake, M Steering Wheel Trim, CF Emblems, Hardwired Escort 8500, Smoked Indicators.