If you want a purpose-built battery that doesn't add much weight and brings a ton of function, we'd say the $99 MagSafe Battery Pack fits the bill.
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⚡【Compatibility】Hard EVA travel portable case especially designed for Apple MagSafe Battery Pack (Case Only, Apple MagSafe Battery Pack is not
Shockproof Carrying Case Compatible with MagSafe Battery Pack, Hard EVA Travel Protective Storage Case for MagSafe Battery Pack with D Buckle -Black
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Strong Magnetic Lock-Hold Fast Snap onto the back of your phone and stay secure in the knowledge its not going anywhere due to the powerful built-in magnets with 1,000 g of holding force. Slip in your pocket, zip around town, take calls, flip through your favorite apps, and rest assured its always there charging away. Small and Portable-Fits Your Life Dont get weighed down by a bulky, inconvenient power bank.
ESR HaloLock MagSafe Battery Pack with USB-C Cable, 5,000mAh Wireless Power Bank Compatible with iPhone 14/14 Plus/14 Pro/14 Pro Max and iPhone 13/12
【Foldable Mag Safe Battery Pack Stand】The MagSafe battery pack with hidden aluminum-alloy stand to enjoy hands-free, 180 degree foldable stand design
Mag-Safe Battery Pack for Apple, 5000mAh Foldable Magnetic Wireless Power Bank with Aluminum Alloy Stand, Portable Travel MagSafe Charger PD 20W Fast
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Craft by Merlin, you can take your creativity one step further by customizing your Apple MagSafe Battery Pack with gorgeous colors and personalized
Merlin Craft Apple MagSafe Battery Pack Pink Matte
ESR HaloLock MagSafe Battery Pack with USB-C Cable, 10,000mAh Wireless Power Bank Compatible with iPhone 14/14 Plus/14 Pro/14 Pro Max and iPhone