Thats BS! You can easily swap out your stock battery and install any aftermarket battery. A lot of people on this forum use lightweight Lithium batteries without any issues.
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2010 Acid Green | ABS DTC Shift Assist | Yoshimura full Ti exhaust | PCV | Sharkskinz belly | Cox guards | Ventureshield | LED turn signals | Gilles+LSL sliders | Powerlet | R&G Tail Tidy | BMW tall-tinted windshield | GB Racing guards
// 2008 X5 Black
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