The Best Battery Cases for Smartphones in 2025

The iPhone 16 Pro’s 3,582mAh battery shouldn’t have a problem lasting throughout the day with moderate usage but when taking pictures, doom scrolling, or gaming, its juice depletes much quicker. The Mophie Juice Pack Battery Case for iPhone 16 Pro will keep the phone lasting even longer thanks to the 2,800mAh battery it’s packing. The case simply slots onto the phone and into the USB-C port. An indicator light is on board to let you know the battery levels and stand-by mode will stop the battery from topping off your device.

Admittedly, the Juice Pack doesn’t offer as much extra battery life as some of our other picks. Still, the 50% battery boost to the iPhone 16 Pro makes a major difference while allowing the case to still be surprisingly compact, adding minimal bulk and weighing about 3.5oz. The phone with the case attached is still easy to handle and slips right into a back pocket or bag, making it one of the best iPhone accessories you can grab.

This case provides excellent protection for the iPhone too, as it’s rated for falls up to 6ft. Thus, you can avoid the minor heart attack that occurs every time the device slips from your grip. Raised edges also help prevent scratches and cracks to the screen and camera. Mophie includes an integrated passive magnet to attach the iPhone to various accessories, but it doesn’t support wireless charging.

Given the absolute behemoth 4,685mAh battery, you might not think the iPhone 16 Pro Max needs extra juice. But there’s a case to be made if you want to go wild in Cinematic Mode or game in Apple Arcade without worrying about it conking out. ZeroLemon’s battery case gives you peace of mind thanks to its two 5,000mAh batteries that add about 1.5 extra charges to your phone. LED indicator lights on the case even let you know the charging status and battery levels.

ZeroLemon’s case is built tough, coming with military-grade protection and shockproofing to protect your phone from damage. Keeping your phone safe and the extra 10,000mAh of juice makes this option significantly bulkier than other cases, so it’s best for someone with larger hands. When you plug in your device to the case via USB-C, speedy 18W fast charging will get your phone from 0% to 100% in about two hours. Unfortunately, there isn’t support for data passing through or wired headsets via the USB-C when the case is attached.

The iPhone SE (2022) is a mighty little budget smartphone, especially considering its stellar performance while running on the latest version of iOS for such a low price. However, its 2,018mAh battery will struggle to make it through an entire day if you plan to use the phone intensively. A solution? The Mophie Juice Pack Wireless delivers a full charge to your phone, keeping you away from power outlets for longer.

In addition to extending the daily usage of your phone, this Mophie case potentially expands its lifetime by wrapping it in a slim, protective shell that doesn’t add too much bulk. Short-circuit, over-charge, and temperature protection keep your device safe. And when you need to top the case back up, you can just set it on a wireless charger and your phone will get juiced up too. Passthrough technology also lets you connect a lightning cable or headphones, so you’ll never need to remove the case.

The Samsung Galaxy S25 has a surprisingly high-capacity 4,000mAh battery for such a compact Android phone. But when you use it all day, the juice will deplete quicker than you think. That’s where the Newdery Battery Case steps in to be a potential gamechanger. You’ll get an extra 8,000mAh of juice –almost two full charges from this battery case – ensuring you never run out of battery when using the phone’s more taxing features, like the cameras or gaming capability, without adding too much extra bulk.

The Newdery Battery Case slides onto your Galaxy S25 and plugs into the USB-C port to deliver juice. Even with the case attached, the USB-C port still offers NFC and data transfer. If you’ve got a wireless charger, you can charge up the case and phone that way, but fast charging via the USB-C means you can get back to 100% quicker. Of course, beyond charging your phone, the TPU and PC materials used in this case add a healthy dose of protection against potential damage.

This case is also available in the Galaxy S25 Plus and Galaxy S25 Ultra models.

Having a battery case is great, but once you upgrade your phone, that case will likely be rendered useless. The Mophie Juice Pack Connect is a battery solution that works for your current phone and probably your next one as well. This battery option isn't exactly a case, as it doesn't cover your phone, but it does attach a battery to it.

With the Juice Pack Connect, you'll stick a small anchor point to your phone or phone case and then you can slip on the 5,000mAh battery pack whenever you need it. The battery itself uses Qi wireless charging, so it supports a variety of smartphones and can recharge wirelessly. It even comes with a stand to prop up your phone when watching clips or reviewing documents.