6 Laptop Charging Bags, Ranked Best to Worst
No matter how long your laptop, phone and tablet last on a single charge, you can always use some extra juice when you hit the road. Carrying a portable power bank makes a lot of sense, but it's even easier if that external battery is built right into your bag with dedicated spaces for ports and wires. A good laptop-charging bag can be pricey investment, so we've tested the major models and ranked them from best to worst.
How we tested
We took the Lenovo Yoga 920 at full charge (12 hours and 22 minutes) and connected each of the fully charged battery packs to calculate the additional power the Yoga received. While each battery was plugged in, we ran our Laptop Mag Battery Test, which involves continuous web surfing over Wi-Fi at 100 nits of brightness until the power is drained. We benchmarked the new battery lifetimes and subtracted 12:22 from the results to determine how much benefit you get from the backpack power banks.
We used the same methods to find the additional runtime added to the iPhone 8 (9 hours and 54 minutes). However our smartphone test involves continuous web surfing at 150 nits instead.
Image Credit: Shaun Lucas/Laptop Mag