I would bet it’s 2.1mm as most I’ve seen are. If you don’t know, and have no way to measure, it seems far more likely to be 2.1mm
But I think the best way is to measure the pin with calipers while it it NOT plugged in.
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if you have a 5.5 x 2.1 jack… plug the fukker in… NOT CONNECTED to the mains… if it don’t fit, then that’s not it…
there is an insulator on all good charger jacks…
if you plug in a 5.5 x 2.5 you don’t know how to science… math not maths (there is only one) is easy
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Well I love this topic, I made one that was initially plug directly into the charge port but finally opted for another solution by making a connection to the extension cable that goes into the vesc antispark…so that the charge can also be monitored with the voltmeter nice and accurate…also waterproof 
A must have IMO so convenient while riding …
that’s awesome
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That’s a good idea
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Aren’t there any options with smart remotes and screens or smart watches? Sounds like a practical pocket solution, no need to look at the board?
There are many such options, but here are the ones which plug into the charge port 
In fact, there are so many options, that building battery gauges into boards is long since obsolete.
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What accurate reader would you suggest for my bike? I just recently installed a permanent one. But it would be fun to have a portable one I could use for it. C13 plugs
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How do I wire it? Project box with a c13 male to female inside and this wired to it?
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2 many wires 4 ya?
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Weirdly, it’s the opposite. I seriously love overcomplicated/overengineered setups. And this feels too simple
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I would not use a project box, I would just epoxy the stuff together.
Thank you for this thread! Saves this noob from more holes(fault points) in enclosure than necessary.
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That’s the reason I made the first one LoL
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Ran out of JB weld? 
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Found a better way. This is a more fluid epoxy but I kept it rotating the entire time it cured so it didn’t drip off.
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