The router supports up to three BBUs at one time. You should install as many BBUs, as needed, up to three, to meet your emergency power requirements.

If all the installed batteries fully discharge while providing backup power to the router, the router will send a dying gasp message and then shut down.

The router's software configuration is not impacted when the router switches from AC power to BBU power.

By default, the UIMs installed in the slots continue to operate normally when the router switches from AC power to BBU power.

You can configure the router to automatically power off specific modules when the router switches to BBU power.

• Shelf life: Shelf life is the length of time before a BBU needs to be recharged in order to avoid BBU over-discharge.

• State of charge: State of charge (SoC) is the amount of charge on a battery and it is expressed as a percentage value. For example, an SoC of 100 percent represents a battery that is fully charged, and an SoC of 0 percent represents a battery that is fully discharged.

The BBU shipping and receiving guidelines define the BBU SoC status and how it can be managed at this stage of the BBU life cycle:

• Cisco ships BBUs with a minimum of 60 percent SoC from the Cisco contract manufacturer.

• Each BBU should have a minimum SoC of 50 percent on being received from the Cisco contract manufacturer.

  • A minimum SoC of 50 percent allows for approximately 10 weeks between shipment from Cisco’s contract manufacturer and a customer checking the SoC.

  • SoC decreases by approximately 1 percent per week (because of self-discharge).

  • The BBU SoC status can be checked using the CLI.

  • BBUs with less than 50 percent SoC should be recharged by the system integrator or customer to >50 percent SoC.

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 BBU, is typically 6 to 12 months.

• Prior to its connection to an AC source, a BBU's shelf life is a minimum of 21 days.

• When long-term storage at a customer site is anticipated, Cisco requires that a BBU be recharged prior to the expiration of shelf life.

• When AC power is disconnected and the Cisco IR8140H router is removed from service:

  • The router switches to DC power supplied by the BBUs and remains powered for approximately 8 hours.

  • After 8 hours the BBUs reach low-voltage disconnect, and the remaining shelf life is a minimum of 21 days.

  • The BBUs 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 SoC prior to the removal of AC power and the BBU being placed in the BBU disable mode.

  • Disabling a BBU at 0 percent SoC means a minimum remaining shelf life of 21 days, and disabling a BBU 100 percent SoC means a maximum remaining shelf life of 386 days.

Instructions for disposal of BBUs:

• For routers under warranty, follow the standard Cisco Return Material Authorization (RMA) procedures.

• If Cisco identifies a BBU or set of BBUs as a nonfunctional item that can be discarded without being returned for failure analysis, BBUs removed for replacement must be disposed of in accordance with local guidelines.

• U.S. and Canadian customers should utilize www.call2recycle.org to properly recycle the lithium ion BBUs.

• For local recycling outside of the U.S. and Canada, customers should contact the following Cisco email for guidance specific to the customer’s country or region—environment@cisco.com

• For further local take-back and recycling information, customers can find the relevant information at: www.cisco-returns.com.

You must use a #1 Phillips screwdriver to install or remove the BBUs inside the BBU cage. You also need these tools:

• T15 Torx Driver

• 10-mm Socket Driver

We recommend that you also read the safety warnings in Installation Safety and Site Preparation.

Warning

There is the danger of explosion if the battery is replaced incorrectly. Replace the battery only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions. Statement 1015

Warning

Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement 1030

When a router operates with different BBU versions, it may result in misbehavior in the BBU functionality.

BBUs are sensitive to electrostatic discharge (ESD) damage that can occur when electronic cards or components are handled improperly, and result in complete or intermittent failures.

To prevent ESD damage, follow these guidelines:

• Always use an ESD wrist or ankle strap and ensure that it makes good skin contact.

• Connect the equipment end of the strap to an unfinished chassis surface.

• Place the BBUs on an antistatic surface or in a static shielding bag. If a BBU will be returned to the factory, immediately place it in a static shielding bag.

• Avoid contact between the battery and clothing. The wrist strap protects the battery from ESD voltages on the body only; ESD voltages on clothing can still cause damage.

• Do not remove the wrist strap until the installation is complete.

During normal operation, the router is powered by the integrated AC power supply. The BBU enters the discharge mode and begins providing power to the router when the AC power is interrupted outside the range of 85 to 250 V for more than 20 ms. The BBUs can either charge or discharge; they cannot support both simultaneously.