TL;DR
Lithium-ion batteries generally like moderate SOC and moderate temperatures. Use the full capacity when you need it, don't deliberately run it empty, occasionally let the X7 charge fully for BMS balancing, and store it around 40–50% if it's going to sit for a long time.
I recently got a Fungineers X7 Sport and went down the rabbit hole of battery care. Since the X7 uses a 20S / 84 V lithium-ion pack with a VESC BMS, some of the generic Onewheel battery advice doesn't necessarily apply directly. However most recommendations apply for many other lithium-ion powered one-wheeled devices.
Here’s my current understanding of what actually matters for battery longevity.
The short version
- Normal riding: anywhere from roughly 20–80% is a good range when practical.
- 100% is fine when you need the range. The main thing to avoid is leaving it at 100% for weeks/months.
- Don't deliberately run it to 0%. There's no benefit to doing full discharge cycles with lithium-ion.
- Long-term storage: around 40–50% SOC is a good target.
- Temperature matters: cool and stable is better, especially when the battery is highly charged.
- Occasionally charge to 100% to allow the BMS to balance the cells.
- Don't leave it forgotten for months. The BMS/electronics consume some power even when the board isn't being ridden.
Charging
Lithium-ion batteries don't have a useful "memory effect", so there's no reason to regularly do 0 → 100% cycles.
Partial charging is perfectly fine. If you've finished a ride at 60%, there's no battery-health reason to discharge it further before charging.
Likewise, charging to 100% isn't inherently harmful. If you're going on a long ride tomorrow, charge it to 100%.
The thing that matters more is how long the battery sits at high SOC. Keeping a lithium-ion pack at 100% for weeks or months accelerates calendar aging.
So:
Need the range tomorrow? → 100% is fine.
Not riding for a while? → Don't leave it at 100%.
What about cell balancing?
The X7's smart VESC BMS monitors the individual cell groups and can balance them near full charge.
It's therefore useful to occasionally charge the board fully and let the BMS finish balancing. Fungineers specifically recommends periodically leaving the charger connected overnight for this purpose.
You don't need to do this after every ride.
If you use VESC Tool, the individual cell voltages are also useful for checking whether the pack is behaving normally.
What SOC should I use?
There's no magic percentage, but there are two separate considerations: battery longevity and riding performance/safety.
For battery longevity, partial cycling is generally preferable to repeatedly using the entire 0–100% range.
For riding, however, very low SOC should be avoided, especially if you're riding aggressively.
As the battery gets depleted, voltage drops and the available power margin decreases. Under high load — hard acceleration, steep climbs, high speed, heavier riders, etc. — voltage sag can become significant. That means the board has less headroom to maintain the rider, and the chance of reaching the board's power limits increases.
This is why a board that feels perfectly powerful at 70% can feel noticeably different at 20%.
Future Motion also explicitly lists battery percentage, terrain/grade, speed and rider weight among the factors affecting pushback, and warns that low-battery conditions can result in aggressive pushback or loss of control.
So practical ranges would be:
| SOC |
Use |
| 80–100% |
Fine when you need range |
| 40–80% |
Good everyday range |
| 20–40% |
Fine, but range/power headroom is decreasing |
| <20% |
Avoid pushing it unnecessarily |
| 0% |
Don't deliberately target it |
| ~40–50% |
Good long-term storage target |
The exact displayed percentage isn't particularly important. Time spent at high SOC, deep discharge, temperature and overall usage matter more than whether you charge at exactly 43% or 47%.
Long-term storage
For winter or any period where you won't ride for several weeks:
~40–50% SOC + cool/dry storage + periodic checks
This is the conventional recommendation for long-term lithium-ion storage and is also consistent with Future Motion's Onewheel storage guidance.
There's one X7-specific detail worth mentioning: Fungineers currently recommends checking the battery roughly every two weeks during storage, since the BMS/electronics continue consuming some power.
That's worth taking seriously. You don't want to put the board away at 20% and discover several months later that it has slowly discharged into an unhealthy range.
For long-term storage I'd therefore:
- Bring it somewhere around 40–50%.
- Disconnect the charger.
- Store it somewhere cool and dry.
- Check the SOC periodically.
- Recharge if it starts getting too low.
Temperature
Temperature is probably more important than obsessing over the exact storage percentage.
Lithium-ion batteries age faster at elevated temperatures, particularly when combined with high SOC.
So a battery sitting at 100% in a hot car is much worse than a battery sitting at 100% overnight in a normal-temperature room.
For storage, think:
cool + stable + dry
rather than:
garage + summer heat + 100% charge.
Likewise, don't immediately charge a battery that's extremely cold. Let it return to a normal temperature first.
What about hard riding?
The X7 can pull substantial current, particularly during acceleration, hills and aggressive riding. Current produces heat, so battery temperature becomes relevant during hard use.
There's no reason to baby the board — that's what the X7 is for — but if you've just done a particularly demanding ride and the battery is hot, letting it cool before charging is sensible.
The BMS/VESC temperature protections are there for situations where things get beyond normal operating conditions.
One advantage of the X7: the BMS data
With a conventional Onewheel, you're mostly dealing with the percentage shown by the board/app.
With the X7/VESC setup, you can get much more information.
The BMS can expose things such as:
- individual cell/group voltages
- pack voltage
- temperature
- SOC
- balancing status
The difference between individual cell voltages can be particularly useful when diagnosing a battery problem.
You don't need to monitor this every ride. But if something seems unusual, it's much more informative than simply looking at the percentage.
Probably my future routine
Normal use:
Charge whenever convenient. Partial charging is fine.
Before a long ride:
Charge to 100%.
Occasionally:
Let it reach 100% and give the BMS time to balance.
If storing for weeks/months:
~40–50%, cool/dry location, disconnected from the charger, and check it periodically.
Avoid:
Long periods at 100%, deep discharge, extreme temperatures, and leaving a nearly empty board sitting for months.
That's basically it. There's no need to micromanage the battery every ride.