Write Back Cache Batteries

This document outlines Field Change Order (FCO) HSWBC-S-0002 regarding a manufacturing defect in write-back cache batteries manufactured in 1996. These batteries are prone to early 'open' failure, which poses a high risk of data loss during a power outage or a low risk of write-back cache downtime. The document provides instructions for identifying affected units, as well as detailed configuration-specific procedures for replacing the batteries, including necessary console commands and safety precautions for electrostatic discharge (ESD) sensitive modules. It also includes patch revision tables for various controllers to ensure proper write-back functionality and reporting instructions for field engineers.