The APC External Battery Pack Rack Tower Smart-UPS X, 48V is an essential device for maintaining a stable computer system. The uninterruptible power supply is spill-proof for added safety. The APC UPS external battery is maintenance-free and hot-swappable to make it even more convenient to use. It offers plug-and-play installation for convenience. The battery cartridges can be replaced without disconnecting the pack or interrupting UPS operation.