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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Apple's MagSafe battery pack is on sale for $79 right now
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Attaching the MagSafe Battery Pack is a snap. Its compact, intuitive design makes on-the-go charging easy. The perfectly aligned magnets keep it
Apple MagSafe Battery Pack
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WWW Case Compatible with Apple MagSafe Battery Pack 2021,Protective Case Compatible with MagSafe Power Bank,Anti-Slip and Anti-fall Shockproof
Hybrid Case for MagSafe Battery Pack
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Magsafe Battery Pack
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Snap Battery Pack