Battery type - Standard or AGM? - New 2009 2010 BMW Z4 - ZPOST
Battery replacement isn't cheap - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
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DIY Battery Replacement - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
Modifications | BMW 135i (N54)
61129217031 Positive Terminal Battery Cable for BMW 135i M3 128i 2008-2012 Red - Newegg.com
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