After multiple high-profile recalls, battery packs are starting to switch to new, safer solid-state technology. We've rounded up the best solid-state MagSafe battery packs for your iPhone to help you pick one. We tested a bunch of solid-state MagSafe-compatible batteries Currently, most batteries on the market are traditional lithium-ion battery cells. It's a tried-and-true technology, utilized for years, that is commonplace and affordable. That doesn't mean the process is without its downsides,