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My bad. I though that I answered some of JoelR's questions...maybe I failed to hit submit?
Anyway, the cluster of wires is the wiring loom as it came on the bike when I got it. The controller has no mount, so I have it secured to the velcro used to tied down the battery.
I did add some XT60 connectors, as well as spliced in a jack connector for the satiator, onto the same mount that came with the bike.

I did not have to do anything to the trays on the bike. It all fit fine.
I will try to take some better pictures and post them to clear things up a bit regarding the mess of wires, and maybe I will get motivated for some spring cleaning...but I am still considering many ideas...for instance, I would like to lose the Kuberg throttle, but need to do some homework to see if a Domino or other electric throttle will work...
I am worried that the controller could go bad sometime in the future, and like I said before, just to replace the throttle in order to get the indicators to work will cost about $500 as I will need a new wiring harness, throttle and controller. So far, piecemealing the battery has been the best mod yet. Then I drilled new mounting holes for the lower shock to level out the bike, and that has helped as well.

I hate the chain on the bike, it is so small, and already shows signs of age. But I do not typically replace chains without also changing out sprockets, and the rear sprocket looks integrated into the rear wheel (though I have not pulled it to confirm)...

Another view

I was able to fit 200*140*70mm in the bike, but I have it standing up, so I should think that the 190*120*70 should work...if you are willing to have it situated vertically.
I did add a plastic box for it to sit in that I lined with some thin foam. I will try to get a picture one of these days.

I really like the look of that MotoTec 1000W bike, looks like an easy bike to work on and even upgrade...like replacing the battery with something better...

Well, I had forgotten about this posting...and what do you know? I went and purchased a SurRon Black.
But I did order a LiPo battery for the Kuberg Cross. This is what I purchased.
"https://www.ebay.com/itm/293314294162"
Now, I know even less, but apparently enough to get into some trouble, but the good news is that nothing dangerous. This battery will shut down if you pull too much current, and it has done so multiple times. (It also does so when voltage is too low...which is a good thing).
In order to reset the BMS, I need to disconnect the battery leads (I am using XT60 connectors, lengthened just enough to be able to reach from the back without removing bodywork). Then we are back on the road.
The SLA batteries that came with the bike were "supposed" to be fairly new, but we would be lucky to get 5 miles out of them. So the LiPo's are great in that have seen 15 miles on the bike...but the power has to be reduced in order to avoid tripping the BMS.
The Cross also has other issues, such as no LED indicators on the throttle...but replacing the throttle requires replacing the entire wiring harness and controller as the bike is a 2015 and has early release parts on it, and I have not had much luck contacting Kuberg over the phone, but did get an estimate of $400 for the parts I assume that I need. It would be much easier to simply add a voltage indicator on the bike, but again, I am not sure what to look for.
My daughter is 9, so the bike is close to getting too small for her, but I LOVE the bike as it is so quiet. She loves it as well...we also have a CRF50 and she prefers that Kuberg every time...It is lighter, and no shifting...quiet, not kick starting, etc. At $700 I feel like I got a great deal, although I COULD nitpik the bike quite a bit as well. -Basically spares pricing is insane, and new bike pricing not much better.