HPE Smart Storage Hybrid Capacitor with Cable Kit (145 mm). The HPE Smart Storage Hybrid Capacitor is a battery-less power storage technology that provides data protection for cached data while eliminating the costs and environmental impact of lithium-ion batteries. In HPE Gen10 servers, the HPE Smart Hybrid Capacitor serves as a centralized backup power source supporting multiple controllers. The NAND flash storage on the HPE Smart Array Performance Class controllers and the HPE Smart Hybrid Capacitor work together to store cached data in the event of an unexpected server power outage. When the hybrid capacitor module detects a power failure, it keeps critical parts of the controller active long enough to copy data from the integrated controller cache to the flash storage.