speaking of UPS's... I -almost- ordered $300 worth of UPS replacement batteries today, but on a hunch, I swapped electronic modules with a twin UPS (the ERM is hotswappable on these 2U 3000VA units), and lo and behold, its the ERM thats faulty, not the battery pack. found a fleabay ERM for $250 (OEM wants $1000). I have 3 of them, all about 5 years old, with 3 2U expansion battery packs, for a total of 9 battery packs, $2000-3000 to replace all of them.