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What is a battery back-up unit (BBU)?

Written by KCOM Support on 17/10/2024. Posted in Phone.

A battery back-up unit (BBU) may be provided by an engineer when we install your full fibre service.

  1. Maintaining your battery back-up unit
  2. What do the lights on the battery back-up unit mean?
  3. Additional support


If provided, it will ensure that your KCOM phone service will continue to work for a limited period in the case of a power outage. The Battery Back Up Unit has a 24 hour run time with 1 hour of talk time. This will enable you to make and receive calls from the emergency services. It also allows you to make and receive important calls from a carer or a doctor as well as a family member, a friend or a neighbour. During a power outage, we would recommend limiting the use of your telephone to all but essential calls.

You must keep the battery back-up unit plugged into a mains power socket and turned on to ensure it is fully charged and so could work in the case of a power outage. It's important to know that, even with a battery back-up unit, in the event of a power outage you'll need a phone that works without mains power (e.g. a corded phone). 

 

Information Icon Something to note

It is important you have the correct type of phone when using a Battery Back Up Unit. A Cordless phone will not work when a BBU is in motion due to a power outage.

You must have a corded phone for the BBU to work. This is because in the event of a power cut, your BBU will power up your ONT, however, a cordless phone will need separate power then what the BBU provides. Where as, a traditional cordless phone will be able to have power provided via the BBU.

Maintaining your battery back-up unit is essential. It should be serviced once a year.

You are responsible for making sure the batteries are charged and for replacing them when necessary. For instructions on how to change the batteries, click here.

If we have provided the BBU because we have identified you as needing additional support that increases your dependency on the phone or because you don't have an alternative method of contacting the emergency services, we will maintain the back-up unit for you. This is to ensure that customers who require protection the most receive this and are not left at risk in the event of a power cut.

If you need this additional support, we'll contact you every 12 months to arrange for an engineer to visit the property to check the battery back-up unit is functioning normally and to replace the rechargeable batteries. It will take no more than 15 minutes to do this work and it's free of charge. If you notice a problem with your battery back-up unit at any time, you should contact us immediately on 151 from your landline or 01482 602151 from your mobile.

What do the lights on the battery back-up unit mean?

BBU

Battery- LED NameColourMeaning
StatusGreenMains power is on
OffMains power is off
FaultRedReplace battery
OffUnit working correctly
ChargingYellowCharging
OffBattery working correctly

 

BBUNumber2

 
Battery - LED nameColourMeaning
Top lightOnMains power is on
OffMains power is off
Bottom LightGreenBattery charging
RedFault - Contact KCOM

 

Information Icon Something to note

If you have the BBU as shown in the above picture, please note that if you need to change the battery or are having any issues please contact us on 151 from your landline or 01482 602151 from your mobile.
 

Additional support

If you live in an area prone to regular power outages, you should contact us on 151 from your landline or 01482 602151 from your mobile. to see whether we have a better solution than a battery back-up unit.

If you're unclear on the impact this change of technology will have on you, speak to your engineer or contact us on 151 from your landline or 01482 602151 from your mobile. We're happy to help and provide you with any information you need.

If you have a particular reliance on your fixed line, then we're here to help. if you have a disability or specific access requirements because of your personal situation, it may be possible to obtain additional support from us. You can visit our contact us page.


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