The Two-X Upgrade Kit is not a standalone product.  It's a battery replacement kit, made to install into the Onewheel or Onewheel+ boards from Future Motion, in place of the stock battery pack.
Installation requires
- SAE Allen wrenches: 3/32", 1/8", 1/4"
- #1 Philips and flathead screwdrivers
- Crescent wrench which opens to at least 1"
- A good needle-nose plier or leatherman
- Blue painter's tape
- A digital or phone camera
Installation does NOT require
- Any permanent modification of any functional parts of the original product.
- Any soldering, crimping, or other wiring which requires specific experience.  All required electrical connections are connectorized.
Who can install the Two-X Upgrade Kit
- The most important thing is to have the will, patience, and time to carefully follow the directions in the video.
- For best results, the installer should be a handy individual good with small tools.  Someone who can, for example, install a car stereo or replace a cracked phone screen, is ideal.
- If this is you, awesome!  And if not, you probably know someone who would be perfect to help you. Still awesome.
- If you're having doubts, you can always seek a willing technician at a local computer repair, car stereo, electric bicycle, or RC hobby shop (show them the install video).
- You will want to line up your plan for this before you order the kit.
Installation video
Join our facebook forum, where anyone may ask questions about their installation of other Two-X users. 


- Best to find a large, flat surface that's clean and well-lit.
- Run down the battery to 75% or so before starting.
- The Onewheel should be clean, so should tools and hands.
- An open-top bin or box makes a great Onewheel stand.
- Installer should be thorough and careful.
- Removed parts should be kept together, with small parts in a ziploc bag.
- Before and After pictures taken for each step are useful in case of problems or if the board is ever to be returned to stock.
- The leftover old battery pack and screws should be saved. Same reason.


It will help to familiarize yourself with the intended Two-X wire routing.  Here are some pictures of a well-done installation, with the wheel removed for a good view of all the wiring:


Be Careful

The Two-X Upgrade Kit integrates deeply with the inner workings of your Onewheel.  While its guts are opened up, care must be taken to avoid breaking stuff in there. Two-X is committed to support our customers with their installations, but we do not perform them, and can't be responsible for what customers might do.

Have Fun

Think of it like building a new Lego kit.  Except with a so-much-more-awesome result.  Be mentally interested in taking on a challenge before you start, and enjoy the process.  Once it's finished, and you go to step on it for the first time, pay attention to any differences in how it feels.  Any sense of accomplishment you feel at this moment is fairly deserved :) 

After Your Install

Directly after your install you are excited to ride your new board and try it out and do range tests or whatever.  So you're not gonna like what I'm gonna say next.

I mean, go ahead and try riding it around a little, that's harmless. Just for 15 minutes or so, but don't go more than a couple miles. Because before you do any more than that, you really should do a full balance charge, to let all the cells completely balance to each other.

To do that, plug in the charger, and leave it plugged in (even though the light will turn green) for 24 to 48 hrs (the longer the better).  You can watch the slow boring balancing progress using pOnewheel android app if you want.

There. Now you can go nuts.

Notes on Weatherproofing

Here's where I use some scare tactics to help you ensure your board doesn't get ended by water leaks.  When you are in there installing Two-X is the perfect time to re-seal your battery box.  Regardless you will need to seal the passage through the gland where the Two-X wires pass through, but you should check all the stock seals as well because they tend to age and fail.
Here's what can happen when water gets in to the battery box.  Don't let this be your BMS:

Water Damaged BMS
Look how an innocent quick dip through a stream can violently demolish a onewheel in minutes.

It turns out that the provisions for the onewheel battery-box water seal are not commensurate to the consequences of its failure.

Water Damaged Battery Box Lid

(Yes, I am totally kidding about "Inspect lid before every ride".  As if ;)

I advise everyone, before you ride thru a single puddle, to pull out your battery box and overhaul its seals carefully, to your own standards of weatherproofing. Whatever those standards are, they'll be better than what you're rocking now.

Here is some good goop to use for this:  3M 08008 ( ).   If you prefer using bad goop, you can use RTV or Silicone available everywhere.
Here are some steps to seal the battery box:

  1. Ensure foam gasket on box top is squishy enough and seating correctly all the way around. Check its coloration for evidence of liquids or particulates.
  2. Keep Two-X wires from being stuck between lid & box sides, jamming seal.
  3. Check the sheet metal lid is flat, not bent too much between each screw and that the screws are tight, uniformly, to seal well.
  4. Add a bead of sealant around the LED window gasket
  5. Fill the gland passage with sealant to fill gaps between two-x wires.
  6. Check the gore-tex pressure vent is sealed all around and not tearing off.

As for water seals of the Two-X satellite packs ...

Although the satellite packs contain no active circuitry and no voltages higher than 13V, they are very hard to open, so if water gets in there it'll end up corroding stuff.  Unless they get damaged, water can only get into them through their tops or around the wire entry point.  Vibration can eventually cause the rubber sealant to fail after heavy use, so periodically you should check the seals and reseal them.  Here's how:

          First, identify suspect areas to add sealant:

  1. Unscrew the two housings and flip em over in place. check the seal around the edge of the box lid, look for open cracks or any non-continuous rubber features which could be a way for liquid to get in.
  2. The entire ring where the wire insulation interfaces with the existing elastomer sealant should be re-filled.
  3. Same goes for the interface between existing elastomer sealant and the walls of the lid and box.

    Now seal em up! :

  4. Squish the 3M sealant goop all down into any cracks with your fingertips. Eeeeew squishy!!

         Yer all done.

Questions on installation?  Email us: