Watch your battery: 56%. Hit the throttle: 52%. Let go: back to 56%. So where did it go? And what actually does shrink your battery over time? This is our Battery 101, 2027 edition. Here is the whole video, and everything in it written out below.
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Why your battery percentage drops when you hit the throttle
When you ask for a lot of power, the battery's voltage dips for a moment. Every battery does this: phones, cars, scooters. That's just physics. Many scooter displays work out your percentage from that voltage, so the number dips, then pops right back up when you ease off the throttle.
Nothing is wrong, and you didn't lose any battery. Want a true number? Check it after the scooter has sat for a while, not right after a hard acceleration.
The three numbers on every battery
- Voltage (V) is the push.
- Amp hours (Ah) is the size of the tank.
- Watt hours (Wh) is push times tank: the total energy, and the number to compare between scooters.
What it looks like inside: the EMOVE RoadRunner Pro
The EMOVE RoadRunner Pro comes in two battery sizes. Both are 72 volts, with 20 cells in one row, so they have the same push. Full, the pack reads about 84 volts. That's why the charger says 84V even though the scooter is 72V.
The 40Ah pack has 8 of those rows side by side. The 60Ah pack has 12. Same push, bigger tank.
| RoadRunner Pro pack | Volts | Amp hours | Watt hours |
|---|---|---|---|
| 40Ah | 72V | 40Ah (8 rows) | about 2,900Wh |
| 60Ah | 72V | 60Ah (12 rows) | about 4,300Wh |
Should you charge to 100% every time?
It is safe. But here is what most people don't think about: a battery ages fastest when it sits full, especially when it's warm. One well known battery research site estimates that a battery stored for a full year at 40% keeps about 96% of its tank. Stored at 100% the whole year, it is left with about 80%.
You don't have to keep yours at 40%. The simple version:
- Riding every day? Around 80 to 90% is the sweet spot.
- Big ride tomorrow? Charge to 100% and go enjoy it.
- Charging overnight? That's fine. Most of our chargers shut themselves off when the battery is full, so you can ride in the morning.
- What to avoid: charging to 100% and then letting the scooter or bike sit for days. When you see the green light, unplug it. It's a good habit.
The VORO app can help. Our free VORO app is out now. On rides that connect, it shows your battery level, and its charge limit alarm tells you when the battery reaches the level you pick while the app is open and connected. With a JBD battery, it shows every cell.
Does cold weather hurt your battery?
Riding in the cold cuts your range, but only while you're riding in the cold. When it warms back up, your range comes back.
When you buy from a seller that has been around a long time, they usually get battery test reports from the manufacturer. Those list the lowest and highest temperatures the cells are rated for. A common cell like the Samsung 50E is rated to ride from about -4°F all the way up to 140°F. Cells are rated to charge above freezing.
- Cold outside? Bring the scooter inside, give it an hour or two, then plug it in. This mostly matters if you ride somewhere very cold.
- After a long, hard ride, let the battery cool down a little before you charge.
Putting your scooter away for winter
- Charge it to about half, or whatever your user manual says.
- Store it inside, somewhere cool and dry.
- Top up the battery once every month or two.
That's it.
Why not store it empty?
Every battery slowly loses a little charge, even when it's turned off. Inside your battery pack there is a small computer called the BMS, the battery management system. Think of it as a lifeguard. Many times a second, it checks every cell group's voltage, the temperature, and how much power is flowing. If anything leaves the safe zone (too full, too empty, too hot, too much power), it flips an electronic switch and cuts the power to protect the cells.
So if the battery drains too low in storage, the lifeguard closes the pool. On many scooters, plugging in the charger opens it back up. If it doesn't, don't open the battery, and don't try parts from other scooters. Talk to your seller, your dealer or the manufacturer.
Is your range shorter than when it was new?
That's normal. Every rechargeable battery (your phone, your laptop, an electric car) holds a little less as the years go by. It's slow, it's expected, and it doesn't mean anything is broken.
First, check the free stuff. None of these are the battery:
- Tire pressure. Low tires make the motor work harder.
- Cold weather.
- Riding faster. The faster you go, the more battery it uses.
- Brake rubbing.
On the battery side, the tank slowly gets a little smaller with use. And a pack is only as strong as its weakest cell group, like a group hike that can only go as fast as the slowest kid. Keeping the group together is one of the BMS's jobs.
One myth: don't drain it to zero to "train" your battery. Lithium batteries don't need training.
Slow and small is completely normal. A sudden, big drop is when you get it checked by your local store or dealer.
Will a fast charger hurt your battery?
Most scooters on the market come with a 1.5 or 2 amp charger. On a big battery, that's like filling a pool with a straw. A 5 amp charger is fast in our world, more like a garden hose, and for a big battery that's still within what the cells are built to take.
Every charger turns some power into heat, which is why it feels warm. Our VM supercharger has an aluminum case and a built in fan, and aluminum moves heat about 1,000 times better than plastic. It also has a knob to adjust the amps: turn it down for an easy overnight charge, or up when you're in a hurry.
Two rules:
- The charger's voltage has to match your scooter. Our EMOVE Cruiser V2 comes in 52V and 60V. They look the same, but they need different chargers. Check the label, and skip cheap universal chargers.
- On a small battery, fast charging is a bigger deal. If you're not sure, ask our support team.
When to stop riding and get your battery checked
Stop riding if
- The case looks swollen, cracked or bent.
- You notice a strange smell from the battery or charger, or anything is leaking.
- It won't charge, or the charger light never changes.
- It won't wake up after storage.
- Your range falls off a cliff: not slowly, but suddenly.
- It shuts off every time you hit the throttle.
- It got soaked, or a crash damaged the battery.
Any of those: stop riding, unplug it, and have your nearest dealer look at the battery. If you bought it from us, sign in on voromotors.com, open My Garage, and file a warranty claim.
Shopping this Black Friday? Compare the tank
Don't just compare prices. Compare the tank: volts times amp hours.
| Scooter | Battery | Tank |
|---|---|---|
| EMOVE Cruiser V2 (52V) | 52V × 30Ah | about 1,560Wh |
| Teverun Fighter Supreme Ultra 2.0 | 72V × 60Ah | about 4,300Wh |
| Teverun Fighter Supreme 7260R | 72V × 60Ah | about 4,300Wh |
The Cruiser V2 is a big battery in a minimal scooter for adults, and its extended handlebars make it easy to share with your family. The Teverun has almost three times the tank. Different riders, different needs.
Our Black Friday prices are live now, and you can get our tool kit or a pair of gold grips free (you only pay mailing), one per order while they last. See the Black Friday page.
If you remember only three things
Battery 101 in three lines
- Daily, charge your scooter or bike to 80 or 90%. 100% only before a big ride.
- Never store your battery empty.
- Charge it at room temperature.
Frequently asked questions
Why does my scooter battery percentage drop when I accelerate, then come back?
Under hard power the battery's voltage dips for a moment, and many displays read the percentage from voltage. The number comes back when you ease off. You didn't lose any charge. For a true reading, check after the scooter has sat for a while.
Should I charge my electric scooter to 100%?
It's safe, but for daily riding 80 to 90% is the sweet spot. Charge to 100% before a big ride. Avoid leaving it at 100% for days, and unplug when you see the green light.
Is it OK to charge my scooter overnight?
Yes. Most of our chargers shut themselves off when the battery is full.
How should I store a scooter battery for winter?
Charge it to about half, or what your user manual says, store it inside somewhere cool and dry, and top it up every month or two. Never store it empty.
Does cold weather damage a scooter battery?
Riding in the cold cuts range only while it's cold, and range comes back when it warms up. Cells are rated to charge above freezing, so bring the scooter inside for an hour or two before you plug it in.
Will a fast charger hurt my battery?
On a big battery, a 5 amp charger is still within what the cells are built to take. The charger's voltage must match your scooter. On a small battery, fast charging matters more, so ask our support team.
Do I need to drain my battery to zero to train it?
No. Lithium batteries don't need training. Draining to zero can make the BMS cut the power.
When should I get my scooter battery checked?
If the case is swollen, cracked or bent; there is a strange smell or a leak; it won't charge or wake up; range drops suddenly; it shuts off under throttle; or it got soaked or crashed. Stop riding and have a dealer check it.
Got a battery question we didn't answer? Leave it in the comments on the video, or contact us.
