Capacity is commonly shown in milliamp-hours (mAh), but that figure alone does not tell you how quickly a power bank can charge a device. Also check output power in watts (W), supported charging standards and the ports provided.
Think about the devices you will charge and how often you need to recharge the power bank itself. A larger capacity usually means more weight and bulk. Manufacturer capacity figures and real-world usable energy are not exactly the same.
Choose products from identifiable manufacturers and sellers. Review safety information, warranty coverage and instructions. Airline rules for spare lithium batteries vary by carrier and country, so check current rules before travelling.
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