A good power bank for an iPhone usually lands between 5,000 mAh and 10,000 mAh, with 10,000 mAh being a popular sweet spot for everyday carry. It’s large enough to handle a full day of errands, commuting, travel, or events, without becoming bulky or heavy in a pocket or bag.
mAh measures the battery capacity inside the power bank, but you won’t get 100% of that into your iPhone. Power conversion and heat loss mean many power banks deliver roughly 60–80% of their rated capacity to your phone. That’s why a 10,000 mAh power bank is often chosen: it typically provides about 1.5 to 2 full iPhone charges in practical use, depending on your model and charging method.
5,000 mAh works well for topping off during the day—great for light users or short trips. 10,000 mAh is a strong all-around option for most iPhone owners, balancing capacity and portability. 20,000 mAh makes sense for long travel days, charging multiple devices, or sharing power, but it’s noticeably heavier and takes longer to recharge.
Capacity matters, but so do charging speed and how you plan to use it. If you prefer snapping a pack onto the back of your phone, a magnetic wireless model can be easier for on-the-go charging, while wired USB-C or Lightning output is usually more efficient and faster. For a deeper look at why 10,000 mAh is a go-to choice for iPhone users—especially in magnetic wireless styles—see this 10,000mAh magnetic wireless power bank guide for iPhone.
Most 10,000mAh power banks take about 3–6 hours to recharge, depending on the input wattage and the wall charger used. Faster USB-C input can significantly cut recharge time versus older 5V/2A inputs.
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