22-08-2026 04:44 PM
Hi all,
Can anyone please confirm for me that this cable:
https://ee.co.uk/products/battery-back-up-plus-connecter-cable-for-smart-hub-2-cable-only
...is the correct one to connect the Cyberpower battery backup unit BT are currently sending out? Many thanks.
Solved! See the answer below or view the solution in context.
22-08-2026 05:55 PM
Thanks, but this is where it's difficult to work out what is required.
The SH2 is not a 2.1mm plug. I know for a fact the SH2 is 3.0mm.
22-08-2026 05:57 PM
No, it's not.
That seems to settle it then. Thanks JimM11
22-08-2026 06:06 PM - edited 22-08-2026 06:36 PM
@Denzel99 Confused now???? Take it you found it's a 2.1mm centre 5.5mm outer? The ONT power connector is for sure 5.5/2.1mm that is why i said get someone to pop that connector on a SH2 if it fit's that is, same voltage etc so would work powered or unpowered for testing....
Did your drill trick and a 3mm does fit all the larger connections, real snug fit, and the 2.5mm also as it would, do not have a 2mm one broken and lost now from the drill kit.
22-08-2026 06:32 PM
I'm not sure where the confusion is coming from but the Smart Hub 2 is a 5.5 x 3.0 mm, the same as the old Home Hub 5 type A. The old Home Hub 5 type B was 5.5 x 2.5 mm. (I know, as I've actually measured all three in the past).
I expect the ONT will vary with the make/model but I'm not looking for a connector for the ONT.
This question has come up a number of times recently and I've yet to see a definitive answer. I tell you what, I'll get the OP to tell me the model number and I'll contact CyberPower support directly. I'll let you know what I find out.
22-08-2026 07:09 PM
@Denzel99 Looking like the 3mm is the one, and CyberPower are American, even in Amazon USA the 3mm one is not even showing up, if the ONT is a true 2.1mm plug then NO WAY it would fit into the back off the CyberPower so if the user has that he can test but UNPOWERED just cord pop on....
Units are the same number with a V1/V2/V3, last being the latest. User is welcome to this set just get's awkward dealing with the sending etc.
23-08-2026 07:42 AM - edited 23-08-2026 08:30 AM
@Denzel99 The connector for the back off the CyberPower BBU is the same as the one for the BT Smart Hub 2, Barrel connector 5.5/3.0mm and for anyone who needs the output of the CyberPower is 12V Centre +ve on the cable.
DTB24U12V-BT1 Marked for ONT connection. cyberpower_bbu__for_fttp.pdf
DTB24U12V-BT2 Marked for the SH2 connection.
DTB24U12V-BT3 Marked for the SH2 or the Smart Hub Plus. Both cables supplied 5.5/3.0mm both sides 1.5M length. 5.5/3.0mm to 3.5/1.35mm 1.5M Length..... This is the best for covering as a single unit because it has both cable types supplied, Larger does a ONT/SH2 and the smaller does the EE Smart Hub 6 Plus and possible the SH3 latest when someone does a check on THAT....
The BT1-BT2 appear to be marked up wrong document and cables, where the BT2 does seem to be for the ONT, so going to leave as is above and the user has to do the due diligence to ensure correct connector ends match the documentation.
ONT is for sure a 5.5/2.1mm barrel but the 3.0mm fits no issue.....
23-08-2026 12:56 PM
Excellent. That answers the question then. Thanks for that.