Promise Technology EX4650A, EX8650A user manual Appendix C Battery Backup Unit

Appendix C: Battery Backup Unit

The Battery Backup Unit (BBU) maintains power to the cache on the SuperTrak EX Controller card, when a power failure occurs to the Host PC. The failure could be due to a problem with the PC’s power supply, a cessation of electrical service, or an accidental disconnection of the power cable.

When power is interrupted, any data in the controller’s cache is lost. The BBU maintains power to the cache so that any data stored there is saved until it can be written to a physical drive.

The BBU is available as a kit, sold separately from the SuperTrak EX Controller card.

The BBU kit includes the following components:

•Battery Assembly – Includes a lithium battery and holder

•Mounting screws (3)

Figure 1. BBU kit

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