There's nothing worse than your iPhone running out of battery right when you need it. A good power bank can be a life-saver for those longer days where you haven't had chance to plug in, and you don't have to carry around a bulky battery and mess of cables to get a bit of extra juice. There are plenty of MagSafe-compatible devices out there that thunk straight onto the back of your iPhone and charge it wirelessly, and the CarbonMag from Sharge is among the thinnest and lightest. And right now it's down to a record-low price of $40 at Amazon. See at AmazonThe charger is typically found for $60, however, a temporary coupon is currently available on its product page at Amazon for $20 off. Just check that box and add it to your cart to secure the savings.While many MagSafe batteries exist, it's the design that sets this one apart. It's constructed with carbon fiber which means it's both rugged and lightweight, weighing just 4.23 ounces, and it's also only 0.35 inches thick so it won't added a ton of bulk to the back of your phone when in use. Hey, did you know?CNET Deals texts are free, easy and save you money.Inside it has a 5,000-mAh battery and, in addition to wireless charging, it has a USB-C port that can power up a secondary device or be used for passthrough charging from the wall while refilling the battery pack. If you need a larger capacity, the 10,000-mAh version is also on sale at Amazon with $25 off. Why this deal mattersThis is the lowest price we've seen for this particular charger, so there's never been a better time to buy it (granted, it's only been out for a few months). If you have an iPhone 12 or newer, then this is a great way to ensure you have some extra power with you without having to tote around a heavy power bank wherever you go.Fancy an upgrade? We've found the best phones deals on the market for 2025 with up to $200 off unlocked models and a $1,000 off via carriers.