Controller Cache Battery

IBM 59Y5491-RFB is a rechargeable replacement battery for compatible IBM storage controller modules. Listed as renewed, it serves as a controller cache battery, helping retain cached data if the main power supply is interrupted.

The battery has a 3.6 V nominal voltage and 1000 mAh capacity. These specifications identify the battery pack; its rechargeable design is intended for a controller module that supports this model.

Use it only in IBM controller modules compatible with 59Y5491-RFB. In those systems, it helps preserve cache contents during a power interruption and can replace a depleted or failed compatible controller cache battery.