Portable mobile charging power bank

What are the best portable chargers & power banks in 2025?

Novem: With this update, our lineup of recommended portable chargers and power banks remains unchanged. The existing picks have been vetted for currency and availability. The Anker Laptop Power Bank has a capacity of 25,000mAh, but more importantly, it can deliver 100W of power from a single port.

Do portable chargers & power banks work if you're out of juice?

These portable chargers and power banks give you the most boost when you're out of juice. Sarah has been writing about consumer tech since 2019 with a focus on ereaders, phones, and tablets. Watching your phone or tablet steadily run out of power when you're nowhere near an outlet is stressful.

How much power does a power bank give a phone?

Our testing shows that a power bank can offer your phone between 70-80% of the power it contains, or more depending on the battery. It loses the rest due to the inefficiency of the power transfer. That means a 5,000 mAh battery can fully charge a phone with a 3,500 mAh battery, like an iPhone 16.

How much power does a power bank charge?

Power banks charge at around 80% efficiency. Most premiere flagship phones have a battery around 5,000 mAh, but a 5,000 mAh battery pack cannot charge your phone to 100%, it will be closer to 80% charged. We've tested these battery packs to see how many times they can charge an average smartphone, and how efficiently they transfer power.