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DDN TECHNICAL SUPPORT | SPT-CRU-0003 (A0) | 27 MAY 2016
© 2016 DDN STORAGE. P/N 15-000836-001 SFA7700 CMOS and Backup Battery Replacement Instructions | 1
SFA7700™
CMOS Coin Cell and Backup Battery
Replacement
The SFA7700 family of products includes not only the SFA7700 but also the SFA7700X and the
embedded processor systems – GS7K (integrated with GRIDScaler) and ES7K (integrated with
EXAScaler).
Each controller contains two batteries, both contained within the body of the controller:
• A battery backup pack.
• A CMOS coin cell battery.
The backup battery serves to provide enough power for the controller to safely flush its cache to the
disks in the event of a power event, thus preserving data integrity. The backup battery pack has a
useable life of three years from the date of manufacture. When the three years have passed, the SFA
OS is designed to place all pools into a write through state to guard against any loss of data.
The CMOS battery serves the same function as that found in regular consumer and enterprise PCs –
to retain certain settings in the unit’s BIOS including current time and date. Its expected life span is
approximately five years.
Because the effective life of the backup battery is less than that of the CMOS battery, most
replacements will be for the backup battery only.
WARNING: Batteries should never be replaced without first consulting DDN Support.
Electrostatic Discharge Warnings (ESD)
Because replacement of the batteries requires direct contact with sensitive interior components, it is
essential that the replacement steps be done in an ESD protected environment.
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