What does the shield icon mean on your Samsung Galaxy?

Your Samsung phone has features to help keep the battery healthy, so you'll see an icon when they're kicking in.

Your Samsung phone has features to help keep the battery healthy, so you&#39;ll see an icon when they&#39;re kicking in.<p><img src="https://www.engadget.com/img/gallery/what-does-the-shield-icon-mean-on-your-samsung-galaxy/intro-1790993396.jpg" /></p>