Maintain the battery subsystem of an APC Symmetra SYA4K8P UPS with a sealed lead-acid replacement battery assembly matched to that platform. Battery Technology SYBT5-BTI uses a 10-cell configuration built around 12 V, 9 Ah SLA batteries, providing the electrical battery format specified for this Symmetra application. It is a replacement-battery component rather than a standalone UPS, power distribution unit, or external battery cabinet. Sealed lead-acid batteries provide the stored DC energy a UPS draws when normal utility power is unavailable. Replacing aged or failed batteries helps return the supported UPS system to its intended battery-backed operating condition. The 10-cell construction makes this assembly distinct from a single loose SLA battery: it is configured as a replacement battery set for the compatible Symmetra system. Match the UPS platform before ordering or installing a replacement battery. This assembly is specified for the APC Symmetra SYA4K8P, and its 12 V, 9 Ah battery rating and 10-cell count should align with the service requirement for that system. The sealed lead-acid construction is appropriate for UPS battery replacement work where the existing battery assembly requires renewal.