When purchasing a portable charger, there are a few things you should consider.
capacity: The capacity of a power bank is measured in milliamp hours (mAh), but this can be a bit misleading as the amount of power you get depends on the cable you use, the device you are charging and the charging method (the Qi wireless Charging is less efficient. You will never reach maximum capacity. We will try to give you an estimate of the device charges.
Loading speeds and standards: Charging power for devices such as smartphones is measured in watts (W), but most power banks indicate voltage (V) and current (A). Luckily, you can calculate the wattage yourself by simply multiplying the voltage and the current. Unfortunately, achieving this maximum rate also depends on your device, the standards it supports, and the charging cable you use. Many smartphones, including Apple’s iPhones, support the Power Delivery (PD) standard, so you can easily charge the device with higher-power power banks. Some phones, such as Samsung’s Galaxy S series, support an additional PD protocol called PPS (Programmable Power Standard), which goes up to 45W. Many phones also support Qualcomm’s proprietary Quick Charge (QC) standard. There are also other proprietary fast charging standards, but you usually won’t find power banks that support them unless they come from the smartphone manufacturer.
passage: If you want to charge your power bank and charge another device at the same time, pass-through support is required. The Nimble, GoalZero, Biolite, Mophie, Zendure and Shargeek portable chargers listed support pass-through charging. Anker has discontinued pass-through support because it has determined that differences between the wall charger output and the device charger input can cause the power bank to cycle on and off quickly, shortening its lifespan. Monoprice also does not support pass-through charging. We advise caution when using pass-through as it can also cause portable chargers to heat up.
Travel: It is safe to travel with a power bank, but there are two restrictions you should be aware of when boarding a flight: you must have the portable charger in your carry-on luggage (it cannot be checked in) and it cannot weigh more than 1000kg be on board 100 Wh (watt hours). If your power bank has a capacity greater than 27,000 mAh, you should check with the airline. There shouldn’t be a problem with that.