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I think the geo is the same as this one: https://geometrygeeks.bike/bike/charge-plug-3-2014/
You'd probably be fine for seat tube length and it's relatively high stack for a bike of its size so you wouldn't be too 'lo-pro' if you have a fair amount of seat post showing... but ETT is quite short so depends if you mind the handling of a longer stem (or longer reach bars).
Someone's coming to take a look tomorrow but LMK in case interested and I can tell you if they don't take it.
Thanks abr, I'll have a look at the measurements but yeah might be a bit small for me. Do you know if the measurements are the same as the current plug? http://www.chargebikes.com/plug-5/