Ixon IQ/Speed battery connector - what plug?

[Bledlow]

Can anyone tell me what type of plug is needed to connect a light to the battery? Obviously, a small DC plug, but what size?

TIA

[Russell]

In the absence of being able to find my charger, eyeballing the connector on the lamp housing I'm going to guess at 3.5 outer, 1.3 pin.

One of these, maybe.  https://cpc.farnell.com/pro-power/ppw01001/1-3mm-dc-power-plug/dp/AV15075?st=dc%20power%20plugs

A 4mm drill is a snug fit in the plastic so the connector barrel is going to be a touch smaller, the pin is more difficult but is similar to a 1mm drill.

Edit: having now found the charger in my electronics bits and bobs drawer rather than in the bike bits and bobs cupboard I can confirm the size of plug above.

[Bledlow]

Thanks. That's helpful.

I could charge the battery, but without an adapter I couldn't plug in any of my lights. But there are adapters for sale . . .