DIY Magnetic Stirrer | How to make a portable Magnetic Stirrer In this video, I show you how to create a Magnetic Stirrer using its magnetic property and use it to easily mix anything that needs to be stirred with this device. To make this Magnetic Stirrer, I used a rechargeable battery that makes this gadget portable. 450 mAh battery, magnetic stirrer does not need to be recharged with each charge for up to a month. That means using the magnetic stirrer about 5 times a day.