Table of Contents
Advertisement
BBU Storage and Handling Guidelines
BBU Storage and Handling Guidelines
The BBU storage and handling guidelines define the BBU shelf life status and how it can be managed at this
stage of the BBU lifecycle:
• The shelf life of a BBU installed in a router with discharge disabled and BBU disabled, or for a spare
• Prior to connection to an AC source, the BBU shelf life is a minimum of 21 days.
• When long term storage at a customer site is anticipated, Cisco requires that the BBUs be recharged prior
• When AC power is disconnected and the Cisco IR8140H router is removed from service:
Recharging a BBU
To recharge a BBU:
Step 1
Connect the router to an AC power source.
Step 2
Enable the BBU.
Step 3
Allow at least 8 hours of charge time per BBU, i.e. for routers with 3 BBUs each, allow 24 hours charge time per router.
Step 4
When the charge time is finished, disable the BBU if the BBU will not be used as backup power for this router.
Installing Battery Backup Units
4
• A minimum SOC of 50% allows for approximately 10 weeks between shipment from Cisco's CM
and a customer checking the SOC.
• SOC decreases approximately 1% per week (due to self-discharge).
• BBU SOC status can be checked using the command line interface (CLI).
• BBUs with less than 50% SOC should be recharged by the system integrator or customer to >50%
SOC.
BBU, is typically 6 to 12 months.
to expiration of shelf life.
• The router switches to DC power supplied by the BBU(s) and remains powered for approximately
8 hours.
• After 8 hours the BBU(s) reaches low voltage disconnect, and the remaining shelf life is a minimum
of 21 days.
• The BBU should be placed in "BBU disable mode" when the router is removed from service in
order to extend BBU shelf life up to 365 + 21 days
• The remaining shelf life depends on the State of Charge prior to removal of AC power and the BBU
being placed in a "BBU disable mode".
• Disabling a BBU at 0% SOC means a minimum remaining shelf life of 21 days, and disabling a
BBU 100% SOC means a maximum remaining shelf life of 386 days.
Installing Battery Backup Units
Advertisement
Chapters
Table of Contents
