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Just depends how much extra power you need. I have a 15 Pro Max and I have a slim 5000mAh MagSafe, grab it if I feel like I might need more power - typically travel days (airline, layover, rental car). Just travelled a few days ago and didn’t need it at all but glad I had it in case of a long delay. It probably adds around 50% of a charge.
 
For me, Anker power banks have been the most reliable and longest lasting.

- ANKER MagGo Power Bank, Slim 10,000mAh Magnetic Battery Pack is smaller/more portable.

- Anker Laptop Power Bank, 25,000mAh Portable Charger with Triple 100W USB-C Ports is highest capacity you can carry on a plane.

 
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Agreed, not sure about a model but I’d get a relatively large one. No point in getting a 3,000 mAh one if it can’t do anything. 10K or higher imo.
 
Ive always used Anker power banks but like others have said it really depends on what you need from a power bank. If you need something just to top you off in the afternoon then something 5k mAH would be fine but if you are traveling or need multiple charges and are charging something besides just your iPhone then something 20k mAH would be more suited. For myself I have a Anker Mag Go 10k that sits in my EDC bag for top offs and a 737 24k for when I need something larger or am charging my MacBook.
 
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