What is difference between 550 mAh and 900 mAh in rechargeble batteries?

Wwwstat Answered First
A 900 mAh battery will last longer than a 550 mAh battery they both must be the same voltage output though to be interchangeable. mAh stands for milli amp hour. The higher the mah number the longer the battery will last
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Where is battery 550 2006 BMW?

Do you mean where is the battery in BMW 2006? Some BMW cars have battery in the Boot (trunk) and you have to lift the cover to see it

Thanks for the feedback!