Approve of the battery swap recommendation as well. No need to get an overpriced OEM battery either.
You are lucky to have stretched the OEM battery life to 6 years actually. The norm is about 4 years, maybe less depending on your use case (short trips, car unused for extended periods, heavy use of hungry accessories such as heated seats, rear window defogger, etc.)
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2011 X3 35i with M pack + 2011 135i w/6SPMT | 255 square tire setup | Quaife 3.46 LSD | Diff lock down bracket | Bilstein B8+Swift SpecR springs+H&R FSB | CDV delete | BMS Oil Tstat bypass | ER FMIC & CP | N54Tuning DP | GC Street Camber Plates | M3 FCA +guide rods+RSFB's+Tranny mounts | Manzo toe arms | Cobb Stg2 agressive tune | Hawk DTC70 brake pads | RB SS brake pistons | Goodridge SS brake lines | Custom brake cooling ducts
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