@HanahsDax
Thanks for the explanation and your own experience.
I checked a hub motor on a electric skateboard and it was notchy due to the magnets.

Maybe someone can give me some insight on a V1 with 200kms I just bought.
The V1 sounds like a turbine compared to the later generations, I do have a Plus and XR.
Also the V1 feel like a typical brushless motor where you can feel the magnets when the wheel is spun by hand with the power off, whereas the Plus and XR feels smooth. Hope it's not the wheel bearings.

@b0ardski
Looks good!
I can't believe what a difference it makes on a long ride.

Being a life long snowboarder and the importance of good bindings, I always felt something missing in riding a Onewheel XR.
My heel side turns on the Onewheel weren't as crisp as my toeside and the longer the distance I rode the weaker my heelside became.

I added a Burris threaded tire which made turns much quicker and then a Kush Hi rear footplate which reduced foot fatigue.
Then when I added a homemade toe plate or"hook" to simulate snowboard bindings so I can tilt the Onewheel easier to heelside and didn't have to fight the board. That when everything changed for me.

I tested it all week and just came back from 2 trips around Stanley Park in Vancouver, Canada (total 22 km ) and that's on the road since the park board closed one lane just for cyclist. Very little leg/foot fatigue and I feel locked in now.
Actually, I made one for the back foot but that after testing, it wasn't necessary.
One size doesn't fit all since some people are regular foot and different shoe sizes and shapes. I have one on my plus also.
They're made of 3/16-1/4" abs plastic, heat gun bent.

I bought a cheap Onewheel plus for testing the different range extenders.
Since the Plus is out of warranty long ago, it's a good platform to hack as my XR is still under warranty and not much need to extend the range anyways.

-The extenders are home built based on commercial types.
-Parallel extender where the Onewheel battery is accessed .
-Xlr type where charging through the charging port while riding. Seen by the Plus as regeneration.

Thoughts and experience:
--- Parallel extender using a 16 -18650 cells is tricky as both batteries should be the same state of charge and not at 100%.
My mistake was the batteries were at 100% , the board went into "overcharge" warning and went into non balance mode.
The board still wouldn't balance after disconnecting the auxiliary battery, but after leaving the board with the lights on for 10 minutes, it recovered and worked fine.
---Xlr system worked great as it will add to the battery percentage slowly. Uphills will pull the percentage down, but evens out.

My own analysis:
-Parallel system , less parts, more work to install.
-Xlr system, more parts and cost ( MTP-7210 solar controller, Hoverboard battery and charger). Very easy to install.

Note the Xlr system won't charge the board if it isn't turn on.
To charge the board without it being turned on, a different Xlr connector is used where the center pin is powered up.

My gawd, now that you pointed it out and I'm seeing the package in a different light, it does look like something menacing.
The grey bag looks questionable and the cigar lighter plug looks like a push button.
Perhaps a defibrillator ? HaHa

I put together this package for charging a Pint. Since the pint has limited range and if you're going somewhere with no electrical outlet, perhaps this can help.
This concept is available commercially and is not new. The new versions have a higher charge rate, I believe ,as they use a higher amperage dc- dc converter.
This version uses a Mtp 7210a dc-dc converter and the observed charging amperage never approached 3 amps.
-It took 45 min to bring the Pint to full charge from 60%
-It is fairly compact
-Supposed to work from as low as 12 volts from a power supply(cigar lighter or power outlet in a car) I will try it out and report back. If it works, then don't have to carry around a inverter and Onewheel charger.
-Uses common 36 volt Hoverboard battery.
-Beats walking if you run out of juice in a remote area.
It's highly unlikely I would ever use the Hoverboard battery option as I live and ride in the city, however the car charger would be great.

@Glyph
Ah. Misread your reply.

Excellent choice! Good idea attaching it to your wrist guard, I get 50/50 putting on my wrist guards. Works good for you riding regular?