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frontpage Posted by Navy-Wife | Staff • Jun 16, 2024
frontpage Posted by Navy-Wife | Staff • Jun 16, 2024

12-Oz Mainstays Rechargeable Warming Stainless Steel Coffee Mug

$25

Walmart
58 Comments 54,980 Views
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Deal Details
Walmart has 12-Oz Mainstays Warming Stainless Steel Coffee Mug on sale for $24.88. Shipping is free w/ Walmart+ (free trial available) or on orders $35+.

Thanks to Deal Hunter Navy-Wife for finding this deal.

Details:
  • Three adjustable temperature levels: 135°, 140°, or 145° F
  • Built-in rechargeable battery keeps your beverage perfectly warmed for up to 2 hours
  • Anti-spill lid
  • Perfect for coffee, tea, hot chocolate, and more
  • Includes charging coaster, lid, and power adapter

Editor's Notes

Written by StrawMan86 | Staff
  • About this Product:
    • This is rated 4.9 out of 5 stars based on over 550 ratings.
  • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Walmart has 12-Oz Mainstays Warming Stainless Steel Coffee Mug on sale for $24.88. Shipping is free w/ Walmart+ (free trial available) or on orders $35+.

Thanks to Deal Hunter Navy-Wife for finding this deal.

Details:
  • Three adjustable temperature levels: 135°, 140°, or 145° F
  • Built-in rechargeable battery keeps your beverage perfectly warmed for up to 2 hours
  • Anti-spill lid
  • Perfect for coffee, tea, hot chocolate, and more
  • Includes charging coaster, lid, and power adapter

Editor's Notes

Written by StrawMan86 | Staff
  • About this Product:
    • This is rated 4.9 out of 5 stars based on over 550 ratings.
  • Please see the original post for additional details & give the WIKI and additional forum comments a read for helpful discussion.

Original Post

Community Voting

Deal Score
+48
Good Deal
Get Deal at Walmart

Price Intelligence

Model: Mainstays Warming Coffee Mug, 12oz. Stainless Steel Coffee Mug with Mug Warmer Coaster and Lid

Deal History 

Sale Price
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Current Prices

Sort: Lowest to Highest | Last Updated 4/23/2025, 11:34 AM
Sold By Sale Price
Walmart$24.88
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Top Comments

Check the prior threads on these.
I am quite confident this is a rebranded Tzumi IonMug and I did a pretty meticulous testing of that one and ultimately returned it.

Bottom line doesn't live up to its claims. Can't heat anything up, marginally slows the cooling of already hot beverages, doesn't last as long as it claims. YMMV. Much cheaper than an ember though.
mode select button the bottom was stupid

edit: I'll add that after documenting the shortcomings I wrote to their support to ask if mine was a dude/operator error/what and got automated "Support ticket created" confirmation emails but zero actual follow up.
It is the same. If you look at recent reviews they're all from "Tzumi Electronics".
I get annoyed when I see comments like "not hot enough" or "insulated mug does the same", "my thermos keeps it hotter', etc.

This and the Ember do something very specific. They keep your drink at the optimal drinking temperature (130-145 degrees Fahrenheit).

Do you like your drink at 190 degrees? Then this is not for you.
Do you want to keep your drink really hot for a while? Then this is not for you.
Do you simply not care about the temperature of your drink as long as it's really hot? Then this is not for you.
Do you drink your drink really fast? Then this is not for you.

But if you like your drink to remain at the optimal temperature and not be too hot or too cold, so you can enjoy it for a while, then this is perfect.

If you're like me who makes the coffee, realizes it's too hot, waits for a while for it to cool down, only to realize it's now too cold, and then microwave it only for it to get too hot, rinse and repeat, this is perfect for you.

If you (like me) spend a lot of time waiting for your drink to cool down to the optimal temperature, only for it to remain there for 10 seconds before getting too cold, this is perfect for you.

I love sitting at my desk in the morning with my coffee sitting on the Ember charger, each sip at the perfect temperature for over an hour, sometimes two.

58 Comments

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Jun 16, 2024
7,356 Posts
Joined Jul 2004
Jun 16, 2024
Brooklynite
Jun 16, 2024
7,356 Posts
I have a glass top desk, could the heat from this crack the glass?
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Deal Editor
Jun 16, 2024
9,734 Posts
Joined Oct 2009
Jun 16, 2024
RazorConcepts
Jun 16, 2024
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Deal Editor
9,734 Posts
Quote from Brooklynite :
I have a glass top desk, could the heat from this crack the glass?
It should be fine, the heating element is in the cup and not in the base
Jun 16, 2024
524 Posts
Joined Nov 2008
Jun 16, 2024
SpEddie
Jun 16, 2024
524 Posts
I bought the Tzumi one from Macy's a while back that looks exactly the same as this. Be sure to heat a couple of cups of water from cold to hot to remove the plasticky smell.

It's bottom heavy, obviously, from the battery and heating element on the bottom but I still use my Norpro cup warmer which is at my desk. This is good for when you're lounging in areas where you don't have a hot plate like the living room or a den.
Jun 16, 2024
2,212 Posts
Joined Jan 2008
Jun 16, 2024
rapidfire94
Jun 16, 2024
2,212 Posts
Quote from SpEddie :
I bought the Tzumi one from Macy's a while back that looks exactly the same as this. Be sure to heat a couple of cups of water from cold to hot to remove the plasticky smell.

It's bottom heavy, obviously, from the battery and heating element on the bottom but I still use my Norpro cup warmer which is at my desk. This is good for when you're lounging in areas where you don't have a hot plate like the living room or a den.
It is the same. If you look at recent reviews they're all from "Tzumi Electronics".
Jun 16, 2024
72 Posts
Joined Jul 2016
Jun 16, 2024
CalebK8051
Jun 16, 2024
72 Posts
Picture on the listing shows 20oz, which is it? I assume 12oz but some of the pictures the cup looks huge
1
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Jun 16, 2024
13,753 Posts
Joined Feb 2007
Jun 16, 2024
sarcasmogratis
Pro
Jun 16, 2024
13,753 Posts

Our community has rated this post as helpful. If you agree, why not thank sarcasmogratis

Check the prior threads on these.
I am quite confident this is a rebranded Tzumi IonMug and I did a pretty meticulous testing of that one and ultimately returned it.

Bottom line doesn't live up to its claims. Can't heat anything up, marginally slows the cooling of already hot beverages, doesn't last as long as it claims. YMMV. Much cheaper than an ember though.
mode select button the bottom was stupid

edit: I'll add that after documenting the shortcomings I wrote to their support to ask if mine was a dude/operator error/what and got automated "Support ticket created" confirmation emails but zero actual follow up.
Last edited by sarcasmogratis June 23, 2024 at 12:15 AM.
4
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Jun 16, 2024
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Jun 16, 2024
dealhunter85
Pro
Jun 16, 2024
6,341 Posts
Quote from CalebK8051 :
Picture on the listing shows 20oz, which is it? I assume 12oz but some of the pictures the cup looks huge
I would buy at 20oz. 12oz is way too small.
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Jun 16, 2024
56 Posts
Joined May 2020
Jun 16, 2024
LovelyStep957
Jun 16, 2024
56 Posts
Quote from dealhunter85 :
I would buy at 20oz. 12oz is way too small.
Personal preference.
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Jun 16, 2024
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dealhunter85
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Jun 16, 2024
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Quote from LovelyStep957 :
Personal preference.
Sure, but seems like 12oz isn't much to need to keep warm. Guess if you drink super slow.
Jun 16, 2024
1,068 Posts
Joined Sep 2003

This comment has been rated as unhelpful by Slickdeals users.

Jun 16, 2024
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Jun 16, 2024
6,341 Posts
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Jun 16, 2024
dealhunter85
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Jun 16, 2024
6,341 Posts
Quote from Lilyly :
what 20 oz of liquid do you need to sip within 2 hr? i have my 8oz cup and its perfectly fine for my keurig at work. select strong 8oz mode. i dont think they even have 20oz in the selection. unless you want hot water with a bit of diluted coffee. if i need another 8oz. i lll do another round. fresh
Ahhhh…Keurig.

I make 12- 16oz at least once a day, so 12oz or 8oz cup just isn't enough for me. Even when I had a keurig, I would make at minimum the 10oz, but would have to make another cup shortly.

I use a Ninja now so I can brew different sizes.

An 8oz cup size must be unique to purchase.
Jun 16, 2024
836 Posts
Joined Apr 2013
Jun 16, 2024
Techiebug
Jun 16, 2024
836 Posts

Our community has rated this post as helpful. If you agree, why not thank Techiebug

I got the Tzumi last time at Macy's and decided to return it. I think it can keep hot for like 2 hours and shut off. That's about just like a regular stainless steel mug. And this thing can not heat the liquid. It can only keep the already hot liquid for 2 hours. That's pretty much useless. More importantly, I don't trust it for potential fire hazard
Last edited by Techiebug June 16, 2024 at 02:40 PM.
1
Jun 16, 2024
8,415 Posts
Joined Feb 2012
Jun 16, 2024
4u2c
Jun 16, 2024
8,415 Posts
Quote from dealhunter85 :
Ahhhh…Keurig.

I make 12- 16oz at least once a day, so 12oz or 8oz cup just isn't enough for me. Even when I had a keurig, I would make at minimum the 10oz, but would have to make another cup shortly.

I use a Ninja now so I can brew different sizes.

An 8oz cup size must be unique to purchase.
Do strong pour overs and embrace Satisfying Gulping Temps.
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Jun 16, 2024
612 Posts
Joined Jan 2015
Jun 16, 2024
romo0012
Jun 16, 2024
612 Posts
Got this with the Macy's deal a few months ago for around $38. It's a good mug, but I had to have it charging most of the time because their is no battery indicator. I sent it back and just use my double wall insulated mugs.

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