Section 5 Maintenance SB821 External Battery Unit
3BSE 027 941 R301 123
SB821 External Battery Unit
The external battery is mounted inside the SB821 External Battery unit. Since the
battery is not rechargeable, it is important to exchange it on a regular basis (refer to
the Maintenance Frequency Schedule for further details). For access to the battery
and housing, remove the cover (see Figure 35 on page 125). When replacing the
battery, be sure to check that polarity and orientation are correct.
Specifications for the external battery:
• Type: Low-rate lithium battery, 3.6 V, 16 Ah
• Size: ANSI Size D / IEC R20
• Lithium contents: 5.6 g
The battery must be exchanged whenever:
• the PM8xx B(attery) LED flashes or is extinguished.
• multiple or extended power cuts have occurred.
• extended periods of system downtime have occurred for maintenance or
malfunctions.
Due to the batteries being connected in parallel, it is necessary, when using the
SB821 external battery, to remove the internal battery from the processor unit
in order to avoid reducing available memory back-up time. In addition, status
monitoring is only provided for one battery.
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