Nextmug - Temperature-Controlled, Self-Heating Coffee Mug (14 oz.) (Slate Blue)

I really love the mug — especially the app-free approach. But there’s one issue that feels oddly dismissive of the user experience.The mug is designed to keep your coffee piping hot for extended periods. Great in theory. But here’s the problem: when coffee stays hot too long, it starts to taste awful — mostly due to evaporation.So, what’s the obvious fix? Just put the lid on. Right?Well… not quite. The included lid has a permanently open drinking hole — meaning heat and vapor constantly escape. So if you use the mug and lid as designed, your coffee turns bitter in 10–15 minutes.Want to fix that? You’ll need to go online, hunt down a compatible closeable lid, spend another $20, and generate more packaging waste — all to make the mug function as it should have from the start.Bottom line: The included lid needs to be closeable. Without that, it actively undermines the mug’s main feature. I wanted to bump the review down to 4 stars over this, but that just felt petty.Anyone want a non-closeable plastic lid with no practical use? Didn’t think so. And so it now lives in my junk drawer….

I bought one of these about year and half ago, since I like to keep my coffee hot and I drink it slowly, which worked great. About 3 weeks ago I had an issue with this product and it would turn off when I removed it from the base. I send an email to company to find out how to fix it or if they know what the issue would be. They replied back to me that they would send me a replacement and only thing was that I had to send back the malfunction product. So, I was very impressed with their service and I thought I should put this in the review section. My new product works great again.

This is a great cup for teas as it holds temperature very well. It has multiple heat settings so depending on if your just start your brew or trying to keep up on drinking it, the mug also has 14 oz for you to enjoy a drink ounces you can throughly enjoy you drink. I got this as a gift and my spouse hasn’t stopped using it. It made it first shower run while the shower was going the mug was keeping the drink warm so there was warm taste when your done. Great handle, easy to grip. It has like a stoneware finish so it plenty think enough thick

I'm not sure what aspect of my being this comes from, but I was finding myself constantly grabbing a cold mug when I finally remembered it was there. I'd make a pot of tea, make my cup, intentionally let it cool, and one way or another it was too cool / cold by the time I got to it. I can't say that I've been monitoring how long it took for the mug to cool down, but it always seemed too quick. I was already looking for a reason to get a new mug as the rounder handle resulted in holding it in a painful way and it was frankly getting heavier to my hands as well (being ceramic). So I had a few reasons to look anyway.And with that in mind, I decided to look for something that might help with those issues or at the least, not let the cup's contents drop below a certain temperature Long enough for me to get around to drinking it, while also having a more comfortable weight and handle. Initially, I thought about those coasters that heat up, but felt that that'd be too much of a burn / fire hazard and likely not able to control the temperature as well. Seeing as how I didn't know what temperature I was waiting for it to cool down too, I knew that I'd want something with a measured setting. I was also looking for something that could heat up a cold cup to the desired temperature.When I first saw this listing, I was taken back by the price, but not so much that it kept me from looking into it. Especially since I have a habit of deciding on things that one way or another tend to push the budget. I looked at the various aspects of the design and saw that it was basically self-contained, so there was a little to no chance of being hurt by the mug (unless I spilled the contents on the upper two settings). Being able to choose from a known selection of temperatures was a must on this purchase. I also liked that the handle appeared (correctly) to be large enough to fit my average sized, closed grip. While I've not weighed it, it definitely feels lighter than a comparably sized ceramic. Most of its weight is, of course, the battery at the bottom.I was a bit bummed that the charger was a barrel plug as that doesn't allow me to just grab the nearest USB-C cord from my station (where I sit). That said, if it Did have USB charging, then it would have only been to the base anyway, so that would be a moot point since it would likely never get unplugged unless moved. While I don't know how much my old mug held, it's quite apparent that this is likely a few ounces less, but it's also exactly 1/3rd of the 1L pot when brewed vs ~2.5 fills with my old mug. I'm sure I'll get used to the difference eventually.Now, when evaluating the performance of this, it became apparent that I was running into my desired functionality vs its design. It has become obvious that this is designed to start with a hot liquid and keep it at the chosen temperature until empty or the battery runs out. It does that quite well, but I can't say how long the battery actually lasts for sure because I lose track of time too easy. So when I say that it 'feels' like it's losing power (not temperature) quicker than advertised, I can't quantify that statement, but it 'feels' closer to 2-2.5 hrs vs 4 hrs (lid on). I can say that I figured out that my comfortable temperature is the lowest setting and that the middle temperature more closely resembles my freshly brewed pot. The charging time feels like forever, but definitely a couple hours from depleted.Now when trying to see how it does with 'heating from cold', that definitely seemed to drain the battery much faster while also taking a long time. I even tried setting it to that middle choice and then turning it back down, but that still drained the battery rather quickly. So if That is how you want to use it, then leave it on the charger until it's hot again (and expect to wait a bit). I did have to stop myself from walking it over to the microwave the first few times until I got myself better trained with how it's designed. Because of this, as much as I hate adding to an already pretty penny, I chose to purchase a 2nd base to sit where I eat / drink. I thought about moving the original base, but then I realized that it was better to leave that there for when I've cleaned the mug (default storage location and all that).What improvements would I like to see?1) Make a slightly larger (16oz?) mug, but have it be taller so that the base and lids don't change.2) Source a higher density battery if possible.3) Increase the speed at which it warms up (if feasible).4) Add a little more texture to the handle / housing as it is metal smooth and slides a bit easy in the hands.5) Offer a closeable lid as that should prevent spills and likely assist in keeping it warmer longer.