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The BMW E30 is equipped with a group 49 battery. When replacing it, ensure to select a battery that delivers a minimum of 600 cold cranking amps to effectively operate your starter during cold weather. Nowadays, the two predominant battery types available are AGM and lead acid. AGM batteries, being newer, incorporate gel and glass mat technology within them, negating the need for regular maintenance like adding water, unlike lead acid batteries. The only drawback with AGM batteries is their higher cost compared to the traditional lead acid option.
The BMW E30 battery is around 49 900 CCA and typically priced at approximately $230 for a replacement.