Where do you guys get replacement UPS batteries from? I have an older APC SmartUPS that takes a couple 12v/12ah batteries. I've gotten them from BatteriesPlus, eBay, and Amazon, but I can never seem to find a brand that lasts more than 2 years. I've heard Yuasa batteries are supposed to be fairly good, but have no idea where to get them. I could get genuine OEM replacement batteries but they're about $150 vs $50-60.