There are a few things to consider when buying a portable charger.
CapacityA power bank’s capacity is measured in milliampere hours (mAh), which can be a bit misleading because the amount of power you get out depends on the cable you’re using, the device you’re charging, and the charging method. Qi wireless charging is less efficient). You will never achieve maximum potential. We try to provide an estimate of what you will get in terms of equipment fees.
Charging speed and levelsThe charging capacity of devices such as smartphones is measured in watts (W), but most power banks list voltage (V) and amperage (A). Fortunately, you can calculate your watts yourself by multiplying the voltage and amps. Unfortunately, getting that maximum depends on your device, the standards it supports, and the charging cable you use. Many smartphones, including Apple’s iPhone, support the Power Delivery (PD) standard, which means you can use high-power banks to charge the device without any problems. A few phones, such as the Samsung Galaxy S range, support an additional PD protocol called PPS (Programmable Power Standard) up to 45W. Many phones also support Qualcomm’s proprietary Quick Charge (QC) standard. There are other proprietary fast charging standards, but you generally won’t find power banks that support them unless they come from a smartphone manufacturer.
to pass: If you charge your power bank and use it to charge another device at the same time, it needs bypass support. The Nimble, GoalZero, Elecjet, Biolite, Mophie, Zendure, and Shargeek portable chargers list pass-through charging support. Anker has dropped bypass support because the difference between the wall charger output and the device’s charger input causes the power bank to cycle on and off too quickly and shorten its service life. We recommend taking care when using a pass-through as portable chargers can get hot.
road trip: It’s okay to travel with a power bank, but there are two restrictions to keep in mind when boarding a flight: You must have the portable charger in your carry-on luggage (can’t be checked in) and it can’t be exceeded. 100 W (watt-hours). If your power bank has a capacity greater than 27,000 mAh, you must check the airline. It should not be a problem below.