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Maximizing Ember Mug Battery and Performance

The Ember mugs were designed to let you drink your perfect temperature, on your time. Our engineers have one goal in mind, and that is to give our customers the best drinking experience possible. We keep the customer in mind throughout the entire design process, including how to get as much battery life as possible. The Ember’s battery life is defined as the amount of time you can use your product before it needs to be recharged. The Ember’s battery lifespan refers to how long the battery itself can last before needing to be replaced.

Below are some of the best practices for getting the most out of your Ember’s battery life, so you are able to enjoy the perfect drinking temperature experience from first sip to last drop.


An introduction to lithium-ion batteries

Why Lithium-ion batteries? The simple answer: they allow us to give customers the best user experience. How do they achieve this? Compared to more traditional batteries, they are able to charge faster, the allow for more battery life per change, they come in a smaller and lighter form factor, and they have a longer battery lifespan.

Another benefit to the lithium-ion battery allows you to charge your mug whenever you’d like. You do not need to let the battery drain to 0%, before fully charging it again. This is because the battery works on charge cycles.


Tips for getting the most out of your Ember


Update to the latest software

One of the unique advantages of the Ember mugs is their advance software and firmware. While the hardware is important (the battery, the physical mug itself), the software tells the mug what to do, and how to do it. Since your mug can connect to your mobile device (iOS and Android), we can send updates via the official Ember mobile app. Just like we are always improving the design of the mug, we are also improving the software the mug runs on too. There may be times where it can be weeks or months between updates, while other times it may be multiple months between updates. These updates are released when there are enough significant improvements.

One of those improvements often focuses on the battery. While this doesn't necessarily mean you’ll get better battery life out of your mug with these updates, there are other updates relating to the battery such as: how the battery charges to increase the longevity of the battery lifespan, the battery accuracy and how it is being displayed on the app or mug itself, and overall improvements to efficiency and safety.

We always recommend updating to the latest software via the Ember app whenever there is an update available.

Click here to learn more about updating your Ember >

Charging your Ember

To charge your Ceramic Mug, place the Ember on the plugged in charging coaster. The Ember will display pulsing red light when it is charging. This light will turn to solid green when the Ember is fully charged and ready for use. The Ember’s exact battery life can be viewed at any time within the settings section of the Ember App. From a dead battery, it will take about two hours to fully charge the Ember.


Expected battery life

Ceramic Mug

When using your Ember Ceramic Mug without the charging coaster, you can expect a battery life of about one hour at a target temperature of about 130°F (54.4°C). The Ember’s battery life may vary significantly depending on a number of factors, including but not limited to: pour temperature, ambient temperature, desired temperature, and if cold creamer was added.

Travel Mug

When using your Ember Travel Mug without the charging coaster, you can expect a battery life of about two hours at a target temperature of about 130°F (54.4°C). Battery life will vary depending on pour temperature, ambient temperature, desired temperature, and if cold creamer was added.


Getting the most out of your Ember’s battery

The Ember’s battery life will vary dramatically depending on the following factors:

Pour Temperature

The Ember’s battery will drain much faster if heaters are being utilized to heat up cold or room temperature liquids vs pouring in liquids that are hotter than the preferred temperature.

Set Temperature

The average temperature of drinking tea or coffee is between 130°F & 135°F. Any higher will require more power from the heaters. On the flip side, drinking lower than 130°F will allow for a slightly longer battery life.

Ambient Temperature

The colder the environment the Ember is around, the harder your Ember is working to maintain the set temperature.

How fast the drink is being consumed

It will take more battery to keep a full 8 oz beverage hot the entire time, rather than the liquid level slowly decreasing over time


Estimated battery life chart

Ceramic Mug battery life chart

The chart below provides the expected battery life dependent on the Ember’s set temperature. For example, at a set temperature of 120°F the Ember has an expected battery life of about 90 minutes, whereas the battery life for a set temperature of 145°F is 45 minutes.

Although we would like for Ember to last hours throughout the day, with the Ceramic Mug, everything that allows Ember's technology to work requires the battery to be used. Utilizing the Charging Coaster when not drinking out of Ember is the best way to stay at the perfect temperature for the longest periods.

The data used in this graph were under these conditions: Pour temperature of 170°F (76.6°C), Ambient temperature of 72°F (22.2°C), and 1.5 ounces of cold creamer added after.

Travel Mug battery life chart

The chart below provides the expected battery life dependent on the Ember’s set temperature. For example, at a set temperature of 120°F the Ember has an expected battery life of about 165 minutes, whereas the battery life for a set temperature of 145°F is 75 minutes.

The data used in this graph were under these conditions: Pour temperature of 170°F (76.6°C), Ambient temperature of 72°F (22.2°C), and 2 ounces of cold creamer added after.


Preventing cold coffee

When the Ember is paired to the Ember App, the App will notify you when your Ember is about to run out of battery and stop heating the beverage. If you are still enjoying your perfect temperature beverage, but battery is about to run out, simply place the Ember on the plugged in Charging Coaster, and it will continue to maintain your preferred temperature.

When your Ember is on the charging coaster, the battery will stay at a constant level and will not charge any higher until your Ember is empty or powered off. This is a battery safety setting that is on the Ember, so it does not overheat the battery when left on the charger for long periods throughout the day with hot liquids inside.

The Ember also has a 2 hour auto shut off if the touch logo is not pressed or the mug accelerometer is not moved.


Additional tips

Update your Ember to the Latest Firmware

Ember firmware updates will show up periodically when a few bugs and improvements are addressed. For best performance, please be sure your Ember’s firmware is always up to date. Firmware updates will become available in the settings section of the Ember App.

Is the Ember Safe to Charge Overnight?

The Ember is 100% safe to keep on the charger when you are not using it. When the battery is fully charged the charging is shut off automatically so no battery damage will occur. We have something called maintenance charging which means that if left on the coaster for months on end the battery is periodically topped off because the battery slowly self-discharges and no harm is done.

On the contrary, the Ember should be charged every couple of months even if it is not in use. Otherwise the battery may become over discharged and could be permanently damaged.

How long will the Ember’s Lithium Ion Battery Last?

The Ember’s lithium battery is designed to keep its lifespan for up to 500 battery cycles.

Still experiencing a shorter than expected battery life? Ember not charging? Our team is here to help! Reach out to us at support@ember.com or visit our Help Bar.