![ionMug & Charging Coaster, 12oz. Stainless Steel Self Heating Coffee Mug with Lid, 3.5" x 3.5" x 5" - Walmart.com ionMug & Charging Coaster, 12oz. Stainless Steel Self Heating Coffee Mug with Lid, 3.5" x 3.5" x 5" - Walmart.com](https://i5.walmartimages.com/asr/a7aa21e9-8c14-4ef0-9549-2fb79db388a9.f47a3671d5db799bf767b7b65c923ed3.jpeg?odnHeight=768&odnWidth=768&odnBg=FFFFFF)
ionMug & Charging Coaster, 12oz. Stainless Steel Self Heating Coffee Mug with Lid, 3.5" x 3.5" x 5" - Walmart.com
![Corrosion on charging rings? Is this normal? I wash and dry thoroughly after each use and return the mug to the charger, but I've noticed this happening and it's concerning me. I Corrosion on charging rings? Is this normal? I wash and dry thoroughly after each use and return the mug to the charger, but I've noticed this happening and it's concerning me. I](https://i.redd.it/rbiatyka5oh61.jpg)
Corrosion on charging rings? Is this normal? I wash and dry thoroughly after each use and return the mug to the charger, but I've noticed this happening and it's concerning me. I
![Ember Smart Mug Charger Repairs - Maker, DIY - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key Ember Smart Mug Charger Repairs - Maker, DIY - Electronic Component and Engineering Solution Forum - TechForum │ Digi-Key](https://global.discourse-cdn.com/digikey/original/2X/b/bee8e899c9fdd0013daba8f307a7f1dda57f8154.jpeg)