The 59Y5260 IBM Battery Backup Unit is a lithium‑ion power source engineered to provide reliable supplemental energy for compatible IBM equipment. Rated at 6.6 volts with a capacity of 1.1 amp‑hours and an energy content of 7.26 watt‑hours, this compact unit delivers consistent performance during brief power interruptions or when primary power is unavailable. Its lithium‑ion chemistry offers a long service life and stable voltage output, while the form factor matches the original IBM specifications for seamless replacement. Ideal for users seeking a dependable backup solution that maintains system stability and protects data integrity.