Ember
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Ember guards your battery against fire

Temperature sensor with app for your e-bike battery

Join the waitlist Expected 2027

Ember gets to know your battery. How warm it gets while charging and how quickly it cools down. Every reading is compared with that pattern. If your battery’s temperature changes, you’ll know.

A black e-bike with the battery built into the down tube, photographed in a dark studio.

Right on your battery

Ember is designed for the most common e-bike batteries, both flat and round. The fit has been tested on a range of brands and models.

Click on. Take off easily

You stick a magnetic sticker near the battery, just once. Then you simply click Ember on and take it off just as easily.

One overview in the app

Ember measures every few minutes, from the outside. The app shows the current temperature, the status and the trend per day, week and month.

A notification when something’s off

Is your battery warming up faster than Ember is used to? Then you’ll get a notification telling you what to do.

An alarm when it overheats

If it overheats, Ember and your phone sound an alarm, even when your phone is on silent. No response? Then your emergency contacts are notified. Ember warns you, but doesn’t stop the charging itself.

Battery fires are on the rise

A growing number of house fires are thought to be caused by the battery of an e-bike, e-scooter or moped.

  • Between 2019 and 20242×as many building fires caused by batteries in the NetherlandsSource: BOVAG
  • In 20241/45house fires likely caused by the battery of an e-bike, e-scooter or moped in the NetherlandsSource: NOS
  • Also internationally20%increase in e-bike fires in London between 2024 and 2025Source: London Fire Brigade

Supported by partners

Ember up close

  • Infrared sensors measure how warm the outside of your battery is. Another sensor measures the air temperature. That way Ember takes the surroundings into account for a reliable reading.

    1. 01Stick on the sticker.You stick the magnetic sticker onto the battery, just once.
    2. 02Click Ember on.You simply click Ember on and take it off just as easily.

  • Lights surround the button. They show the same colour as the app: green is normal, orange needs attention, red is too hot.

  • With the Ember app you know how your battery is doing. You see how warm it is now, whether that’s normal and how the temperature changes over the day, week or month. Does your battery need attention? Then you get a notification with advice on what to do.

  • 10.5 × 3.5 × 1.5 cm. Dark grey, satin matte and cleanly designed.

  • Ember, the magnetic sticker and a USB-C cable. You charge it about once every three months. Download the app from the App Store or Google Play.

What’s in the box: a coiled USB-C cable, Ember and the magnetic sticker.

USB-C cable

Ember

Magnetic sticker

Frequently asked questions

  • Ember can’t guarantee 100% that a fire will be prevented. Ember detects as early as possible that something is going wrong with your battery, so you can step in in time.

  • Ember first learns how your battery normally behaves, for example how warm it gets while charging and at rest. Ember doesn’t just look at what is happening now, but also at where it’s heading. Ember’s prediction model recognises patterns that often come before a battery fire. That way Ember can see a dangerous situation coming, often before there is any smoke or fire. That gives you time to step in.

  • Ember measures the surface temperature of your battery. It also measures the ambient temperature.

  • Ember is designed for the most common e-bike batteries, both flat and round. The fit has been tested on a range of brands and models.

  • Ember has its own battery. You charge it about once every three months with the USB-C cable in the box.

  • Expected in 2027. There’s no price yet. Join the waitlist and you’ll be the first to know.

    Join the waitlist

  • Yes. We’re looking for pilot users with an e-bike. Join the waitlist and let us know you’d like to take part in the pilot.

    Join the waitlist

  • We’ll reply by email.