I have developed a handheld electric icing/heating gizmo that can be powered by portable batteries. It can replace ice packs and heat packs. It can also be used for keeping your drinks cool, such as beer, wine, or coke. There is an option to change the high temperature setting for heating your coffee too.
I am running a Kickstarter campaign right now and it will close on 01/15/2017. Please check it outkickstarter.com - Infinite Electric Icing & Heating for Sport Injuries