This replaceable battery cartridge from American Power Conversion (APC) is user-replaceable and hot-swappable. It allows users to swap batteries without any downtime for the units. The maintenance-free sealed lead-acid batteries with suspended electrolyte are shipped in a reusable carton. This battery cartridge works with APC's Smart-UPS 450 (SU450), Smart-UPS 450 Net (SU450NET), Smart-UPS 700 (SU700), and Smart-UPS 700 Net (SU700NET). A typical battery should last for three to five years.