topic Re: broadband battery backup in Everything else

broadband battery backup

citroenDS2 — Fri, 19 Jun 2026 14:48:55 GMT

I've just bought a Broadband battery backup from Vodafone (UPS) but am very disappointed to find that the pin does not fit into my router (too big). The router is a D-Link M60, and it looks like it takes a 3mm or 4mm (can't measure it clearly) instead of the 5mm provided on the Vodafone backup. Anyone know if it's possible to get an adaptor that would make it possible to use this device?

(I can't find any way to ask this question of Vodafone, which has not been a good start.)

Re: broadband battery backup

RadioFox — Fri, 19 Jun 2026 15:43:43 GMT

Assuming that the barrel jack supplied with the UPS is the common 5.5 x 2.1mm, then adapter sets can be found on Amazon & eBay. As well as getting the correct fit, make sure that the actual voltage is correct too. Nearly every barrel connector has +ve to the centre pin these days, but it's worth checking that too.

This set has 3.5 & 4mm OD adapters...

WANGCL 8 in 1 Barrel Jack Adapter, 5.5 x 2.1mm Universal DC Barrel Connector Jack, DC Tip Set Socket Plug Accessories for Laptop Charger Power Supply Plug: Amazon.co.uk: Computers & Accessories

Re: broadband battery backup

citroenDS2 — Fri, 19 Jun 2026 16:25:29 GMT

thanks for your feedback.

I tried contacting D-link to check the size of existing pin and they didn't know - just thought that it most likely uses a 5.5mm outer barrel with inner pin being, most commonly 2.1mm (or possibly 2.5mm).

The pin on the battery backup > router cable is quite a bit larger, looks like it could be 3.00mm inside.

This is not precise enough for my liking.

I do have exact voltage.amp/power specs, but no idea how to check +v centre pin. I'd hate to get anything so specialised wrong.

Re: broadband battery backup

Dan_the_Van — Fri, 19 Jun 2026 16:41:11 GMT

@citroenDS2

Look at the device, you should see something like below to confirm polarity.

Re: broadband battery backup

citroenDS2 — Fri, 19 Jun 2026 17:07:36 GMT

that was helpful - it's positive!

Re: broadband battery backup

citroenDS — Mon, 22 Jun 2026 11:43:20 GMT

I'm finding it very difficult find that adaptor.

My router (i think) has a DC plug which is 5.5mm 2.1mm

The plug for the Vodafone battery backup (I think) is a 5.5mm 3.0mm

Anyone been in the same position, and found one?

Re: broadband battery backup

MisterW — Mon, 22 Jun 2026 11:56:19 GMT

The plug for the Vodafone battery backup (I think) is a 5.5mm 3.0mm

A typical size for a 3mm centre is 6.5 x 3.0 .

If that's what you have , then this https://www.amazon.co.uk/PNGKNYOCN-Converter-Security-Surveillance-Syste%EF%BC%882-Pack%EF%BC%89/dp/B0D2QHWP28

MIGHT be suitable...

Re: broadband battery backup

RadioFox — Mon, 22 Jun 2026 17:12:05 GMT

@citroenDS wrote:

I'm finding it very difficult find that adaptor.

My router (i think) has a DC plug which is 5.5mm 2.1mm

The plug for the Vodafone battery backup (I think) is a 5.5mm 3.0mm

Anyone been in the same position, and found one?

I'm getting a bit confused now. Is the connector from the UPS a female connector? i.e. does it have a hollow centre like most regular barrel connectors? Does the DC input connector on the router have the centre pin?

If you think the router takes a standard 5.5 x 2.1, and the UPS has a 5.5 X 3.0, then it should still fit, but the inner pin might not make a connection, as it's a 2.1mm pin inside a 3.0mm hole.

Does the UPS connector push into the router's connector at all?