APC SYCFXR8 Extended Run Battery Cabinet 21,504 VAh | Symmetra PX

When a standard UPS battery string is not enough, this APC external battery cabinet adds the runtime reserve required for longer outages and more controlled recovery. With 21,504 VAh of stored energy, it is built to support Symmetra PX 40 kW UPS environments that need more than brief ride-through protection. The cabinet’s hot-swappable design helps keep maintenance from becoming an availability event. Teams can service the battery system while preserving the UPS power path, which is essential in facilities where every interruption carries operational cost. Lead acid chemistry provides a familiar, proven foundation for enterprise backup power, and the external cabinet format gives infrastructure teams a clean way to scale runtime without redesigning the UPS architecture. This model fits deployments where runtime planning is part of the power strategy: data centers, critical network rooms, and high-availability edge sites that need a larger battery reserve than an integrated UPS can provide. For organizations that value predictable backup behavior and a cabinet engineered for extended run time, it delivers the capacity and serviceability expected from a premium APC battery solution.