https://community.bt.com/t5/Home-setup-Wi-Fi-network/BBU-Charge/m-p/2254372#M198063 The BBU is a throwback to when BT offered FVA and a phone could be connected to the ONT to provide telephony, this is now redundant , if you want to use the BBU that’s upto you but it isn’t required…it’s the status of the ONT itself ( not the battery back up unit ) that is important.<BR />You can transfer the power lead from the BBU and insert into the ONT , these days ONT’s don’t get a BBU , the ONT is powered solely from the mains Fri, 30 Sep 2022 23:04:48 GMT iniltous 2022-09-30T23:04:48Z https://community.bt.com/t5/Home-setup-Wi-Fi-network/BBU-Charge/m-p/2254369#M198062 <P>Hello,</P><P>I have just joined BT. Our broadband was supposed to begin yesterday but it’s still on an orange light. This is because our BBU had a fault so I replaced the batteries.&nbsp;<BR /><BR />The light on the BBU is now yellow despite being replaced with new rechargeable batteries. How long does it take to charge and turn Green?</P><P>Hope this makes sense!</P> Fri, 30 Sep 2022 21:57:15 GMT https://community.bt.com/t5/Home-setup-Wi-Fi-network/BBU-Charge/m-p/2254369#M198062 stephens61086 2022-09-30T21:57:15Z https://community.bt.com/t5/Home-setup-Wi-Fi-network/BBU-Charge/m-p/2254372#M198063 The BBU is a throwback to when BT offered FVA and a phone could be connected to the ONT to provide telephony, this is now redundant , if you want to use the BBU that’s upto you but it isn’t required…it’s the status of the ONT itself ( not the battery back up unit ) that is important.<BR />You can transfer the power lead from the BBU and insert into the ONT , these days ONT’s don’t get a BBU , the ONT is powered solely from the mains Fri, 30 Sep 2022 23:04:48 GMT https://community.bt.com/t5/Home-setup-Wi-Fi-network/BBU-Charge/m-p/2254372#M198063 iniltous 2022-09-30T23:04:48Z