Ember Mug 2 (10 oz) Review: Would Owners Buy It Again?
Disclosure: As an Amazon Associate I earn from qualifying purchases. If you buy through links on this page we may earn a commission at no extra cost to you. How this review was made: We did not test this mug in person. This verdict is based on our analysis of an expert hands-on review, a review summary and owner complaints on Trustpilot, all listed at the end. Trustpilot reviews skew toward unhappy customers, so we weigh them as a signal of common failure types, not of how often failures happen. Our method.
Great at its one job, but plan for battery and charging wear
The Ember Mug 2 does what it promises: Home Grounds found it held the set temperature within about 1°F, with up to about 90 minutes of battery on the 10 oz model and unlimited time on its coaster. Slow sippers love it. But the battery is not user-replaceable, reviewers say it starts losing capacity after roughly two to three years, and owners frequently report charging-coaster contact problems and slow warranty support. If you sip slowly at a desk and accept it as a few-year gadget, it delights; if you want something that lasts, think twice.
Check current price on Amazon → Prices and availability change often, so we don't list them here.Buy it again if you…
- sip coffee or tea slowly at a desk
- care about an exact drinking temperature
- keep the mug on its coaster most of the time
Skip it if you…
- drink quickly or carry your mug around all day
- want a gadget that lasts many years
- dislike phone apps or want a dishwasher-safe mug
The Ember Temperature Control Smart Mug 2 is a 10 oz ceramic-coated stainless steel mug with a built-in heater and battery. You set a drinking temperature, by default 135°F, in the Ember app, and the mug holds it until the battery runs out or indefinitely while it sits on its charging coaster.
We looked closely at battery life and battery or charging failures over time, since these are the most discussed issues.
What owners say, at a glance
Bars show our editorial summary of how consistently owners praise or complain about each area across all sources — not a lab measurement.
The key specs
| Capacity | 10 oz (a 14 oz version also exists) |
|---|---|
| Temperature range | 120°F to 145°F, default 135°F |
| Battery | Up to about 90 minutes; unlimited on the coaster |
| Cleaning | Hand wash only; waterproof when submerged to 1 m |
| Controls | Ember app via Bluetooth; no buttons for settings on the mug |
| Warranty | One year |
What owners love
What owners complain about
How it holds up over time
This is where the Ember is weakest. The lithium battery is sealed in and wears with charge cycles, so most reviewers treat the mug as a two-to-three-year gadget. The warranty is one year. Owners who keep it on the coaster report fewer frustrations, because a weak battery matters less there. Keep the coaster contacts clean and dry the mug fully before setting it down.
Tips from owners
- Pour in hot coffee, since the mug keeps drinks warm rather than heating cold ones quickly.
- Use a lid to stretch battery time.
- Dry the base completely before placing it on the coaster.
- Register the mug and keep proof of purchase for warranty claims.
Pros and cons
What owners love
- Holds an exact drinking temperature
- Unlimited warmth on the coaster
- Premium look and feel
- App remembers your settings
What owners complain about
- Sealed battery fades after a few years
- Charging-contact failures are commonly reported
- Slow warranty support in owner reports
- Hand wash only and narrow temperature range
Other options owners compare
These are the warmers and heated mugs most often compared with the Ember.
| Model | Style | Consider it if… | |
|---|---|---|---|
| Ember Mug 2, 10 oz (this review) | Battery smart mug | You want exact temperature control away from the coaster | See on Amazon |
| VSITOO S3 Pro | Self-heating mug with coaster | You want a heated mug without a phone app | See on Amazon |
| Mr. Coffee Mug Warmer | Plate warmer | You sit at a desk and want a simple warmer for any mug | See on Amazon |
Tired of cold coffee halfway through?
Check the current price and colors on Amazon.
Frequently asked questions
How long does the battery last?
Up to about 90 minutes on the 10 oz model, less with the lid off, in cold rooms or at higher settings. On the coaster it lasts indefinitely.
Can I replace the battery?
No. Reviewers say it is not user-replaceable and begins to fade after about two to three years.
Is it dishwasher safe?
No. Hand wash it; it is waterproof when submerged to 1 m.
Do I need the app?
For changing temperature and most settings, yes. It works at the default 135°F without it.
Save this review for later
Pin it, share it, or send it to someone who's shopping for one.
Sources we analyzed
- Home Grounds: Ember mug review — battery time, temperature range, cleaning, battery lifespan, verdict
- ShopSavvy: Ember Smart Mug 2 10 oz review summary — battery decline, app and Bluetooth issues
- Trustpilot: Ember Technologies reviews — charging contacts, battery wear, warranty and support complaints
Figures reflect each source as of October 12, 2026 and may change. We summarize owner feedback in our own words and do not reproduce retailer reviews.