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A battery-powered device can run for less time in the cold even when its battery is not permanently worn out.

Battery percentage is an estimate of remaining usable capacity, not a direct view inside the cells.

A power bank advertised as 20000mAh may deliver a smaller milliamp-hour figure at its USB output without anything being missing.

A power bank can have plenty of charge remaining and still stop powering a small accessory.

A charger labeled 65W does not consume 65W continuously just because it is plugged in.

A USB-C dock can charge a laptop while producing no picture on a connected monitor.

USB-C is designed to be reversible.

A compact GaN charger can feel warm even when it is more efficient than an older design.

Wireless charging is convenient, but not all electricity entering the pad reaches the battery.

Fast charging is usually fastest during only part of the battery refill.