Here’s an alternative, locally sourced, and at a great price: Bulldog Battery, in Willoughby has a great substitute for the BMW battery (especially the LT). It’s a power chair battery, deep cycle, same physical size and more cranking amps than the stock unit. Good warranty, and since they’re local, superb customer service, to boot. I have had the battery in my LT for a couple of years now, and am very pleased with its performance. My recollection is that it’s about $75 or so. Give them a call. What do you have to lose?