Take it out for a nice long drive (~45mins) with only 1 start. Multiple starts on a low battery will kill it sooner. Either way the battery will likely need replacing soon. Batteries Plus battery store - All your battery needs for Laptop, camera, cell phone, camcorder, SLA, batteries recycling and much more.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean