I Tried to Melt a Bunch of Smartphones to Find Out How You Can Save Your Battery - Heat is killing your battery. Our columnist provides some tips on how to protect your iPh... - https://www.wsj.com/articles/i-tried-to-melt-a-bunch-of-smartphones-to-find-out-how-you-can-save-your-battery-d75066d1?mod=rss_Technology #paid