There are a few things to think about when buying a portable charger.
Power: The capacity of a power bank is measured in milliampere hours (mAh), but this can be a little misleading because the amount of power you get out depends on the cable you use, the device you charge, and the charging method. (Qi wireless charging doesn’t work well). You will never get a large dose. We try to give an estimate of what you will get in terms of the cost of the devices.
Charging speeds and rates: The charging rate of devices such as smartphones is measured in watts (W), but most power banks list voltage (V) and amperage (A). Fortunately, you can calculate the wattage yourself by multiplying the voltage and amperage. Unfortunately, getting that high rate also depends on your device, the standards it supports, and the charging cable you use. Most mobile phones, including Apple’s iPhones, support standard power delivery, which means you can use high power banks to charge the device without problems. A few phones, such as the Samsung Galaxy S range, support an additional PD protocol called PPS (Programmable Power Supply) that goes up to 45 W. Most phones also support Qualcomm’s proprietary Quick Charge (QC) standard. There are other standards for fast charging, but you usually won’t find power banks that support them unless they come from a smartphone manufacturer.
Go through: If you want to charge your power bank and use it to charge another device at the same time, it will need pass-through support. Nimble, GoalZero, Biolite, Mophie, Zendure, and Charge portable chargers are on the list of pass-through charging support. Anker has dropped support for bypassing some of its products because it found that the difference between the output of the wall charger and the charging input of the device can cause the power bank to turn on and off too quickly and shorten its lifespan. Monoprice also does not support transit charging. We would advise caution when using a pass-through, as it can also cause portable chargers to overheat.
Walking: It is safe to travel with a power bank, but there are two restrictions to remember when boarding a plane: You must have a portable charger in your carry-on luggage (it cannot be checked), and it must not exceed 100 Wh (watt hours). If your power bank has a capacity greater than 27,000 mAh, you should check with the airline. Less than that shouldn’t be a problem.
