Coffee Temperature Control Travel Coffee Mug and Desktop Warmer, Long Lasting Battery Powered Heated Portable Smart Mug, Stainless Steel, 16 oz, Black

I purchased a Cauldryn Fyre when it was first released last year, but found myself using it primarily to maintain the temperature of my coffee throughout the day. When Cauldryn released this model designed specifically for coffee drinkers, I was intrigued enough by the additional coffee-focused features to give it a try. I am glad I did, as it's clear that the makers put some thought into what exactly coffee-drinkers such as myself were looking for.First of all, the bottle is substantially lighter than the Fyre Mobile. I'm not sure whether this is from improvements in manufacturing, or whether they can simply use a lower-capacity battery when there is no need to bring water all the way to a boil. In either case, I have never come close to draining the battery even with a full day's use. I really underestimated how much having a lighter bottle improves the daily experience, and this alone could make an upgrade worth it for those who carry their Cauldryn around all day.Second, you can now select any temperature you'd like to maintain your drink at. This is huge! I've really enjoyed playing around with this feature to hone in on the exact temperature I like to drink different coffees at. Along with this, it also has a nice LED readout that tells you what the temperature is.The lid on this new model is also a bit different. Personally, I prefer this lid to the original, as it seems to have a better "feel" to it. I'm not sure what else I can say about this, I just wanted to note that this is a difference between the models.This model also features a removable base that makes this a modular unit that you can add different accessories to. For example, I see that they have a coffee grinder attachment. I have not used any of these accessories, but I do like the idea of being able to easily expand the Cauldryn to find new uses.Finally, there is an app that you can use to control the Cauldryn remotely. I plan to use this to start heating the water while out for lunch in those situations where I want a single-cup pourover when I get back to the office.All in all, I am very happy I decided to purchase this new model of the Cauldryn. It comes in at basically the same price point, and with additional features that really add to the experience.

I love this mug with a few exceptions! First, I think that the bases, both the homebase and the battery base should have some sort of nonskid rubber on the bottom. My granddaughter kicked the cord earlier, and I was afraid it was going to go flying, and grabbed it just in time. I also think that while the battery is great, a way to charge it on the go should have been included as well. I purchased the vehicle base for long trips. That was something that was important to me, but wasn’t included. It’s easy to clean, though some people might think it’s a pain, the reason for it makes sense. You don’t want to get the bottom of it wet, as that’s where the buttons and the LCD are. The app could use some accessibility updates. The temperature wheel does not work for those who have to use screen readers, such as voiceover, built-in to the iPhone. You can go up degree by degree, but when you need to go up to a high temperature, it’s not all that easy, or efficient. I have more important things to do than sit there pressing a button for 187°, degree by degree for example. all in all, it does what I wanted it to do, which is why I rated it five stars. It would be more giftable if the price wasn’t so high though.

TL DR: great concept, some kinks to be worked out; but for someone that has been working out in the cold all day wanting a piping hot cup of coffee without running to a shop, it's worth it.Pros: As of November 2018, this really is the only one on the market that holds a charge of up to 10 hours on the go. It's Bluetooth enabled, so in theory you can set your drink up to temperature and be greeted by a piping hot cup when you get in your car. I've not tried this yet.The charger is very similar to a laptop charging cable, so if you happen to forget the charger but have a laptop on hand, you can charge it. Just make sure the specs are within 10%.Cons: the temp display is about 10 degrees off. When the cup read 130, the actual temp was closer to 120. At first I thought I received one with a bad temp sensor. But, when I went to increase the temp on the cup from 130 to 140, the cup now registered 120 then slowly started climbing to 140.For the next test, the bottle was filled with 48.9 degree water and set to a goal temp of 150. Forty minutes later with the ac adapter, the cup read 150, the thermometer read 147.7. Unreliable temp sensor?It took 40 min on ac power to get from 99 degrees to “boiling” 212. The ambient temp was 66. The actual temp registered 206.4 when the cup displayed 212. The cup will not go above 212. I highly doubt it can get to a 2 min sustained rolling boil to actually sterilize.As a vacuum sealed travel mug, it performed on par with a metal freebie giveaway mug with a clear plastic sip lid and was beaten by a $15 Contigo Snapseal Byron mug.Methodology: 3 metal travel mugs: freebie, Contigo and Cauldryn were filled with their perspective max liquid: 15, 20 and 16oz respectively. The ambient temp was 65.8 They were all filled with boiling (212 rolling boil) water from a pot. Once the boiling water was in the mugs, the temps fell to: 203.3, 205.7 and 205.7 respectively. The exterior temp of the mugs were: 69.9, 74.3 and 73.9 as measured by a Craftsman ir heat gun. The lid/ lip portion temps measured: 156, 95.7 and 77.9. once all the mugs were sealed, the Cauldryn made the most hissing sounds while the freebie was silent. The Contigo made sounds but was nowhere near as loud as the Cauldryn. After 11 hours overnight (it's a weekend, I slept in), the exterior temps all read around 68, the ambient temp was still 65.8. the lip/lid portion read: 77.9, 76.4 and 70.1. The water temps were: 89.8, 103.4 and 88.3. It was disheartening to see that a freebie mug with less liquid performed on par as the Cauldryn.The lid is not leak proof; if you shake/drop the cup, it will leak.Out of the box, there was a paint drip (?) on the inside ring on the base of the cup. This doesn't come in contact with your drink, but it makes me question the quality of manufacturing.I've already made a scald spot on the bottom of the base with my coffee with light milk and sugar after 1 use.You have to be very careful when unscrewing the base vs the battery. You don't want to unscrew the base with hot liquid inside!The rubber cover on the battery pack broke off after the 2nd full charge.The battery with 16 oz of liquid weighs 2 lbs 13 oz. In comparison, a 16.9 oz disposable water bottle weighs 1 lbs 3 oz. The bottle itself with liquid weighs 2 lbs 3oz.The battery takes 2 hours to change, but for 10 hours of run time.But one time when the cup was left in the winter car (approx temp 30-40), with full battery in the am, the battery just blinked and did not warm coffee. It seems temperamental, because the next day it warmed the coffee to lukewarm just fine in similar temps.All in all, if you want a warm drink waiting in your car after a long day of working outside, this gadget is for you. Just keep in mind the temp on the cup may or may not match the actual liquid temp.*Update 12/6/18 updated to 4 stars from 3 for their customer service.I sent them an email per the instructions in the comments to this review and they promptly sent me a new base and rubber cover!