Wired external chargers use ports such as USB-C and Micro USB; some models have integrated USB-C cables instead of a separate port. Several wireless chargers don’t list any wired connection ports because they deliver power wirelessly.

Portable options include NiMH AA cells rated at about 1300 mAh (1.2 V) and a portable lithium-based battery pack listed at 1460 mAh. The results also note several chargers and adapters that do not include an internal battery.

Many items advertise fast-charge or quick-charge capabilities, including specific fast-wireless modes and fast-charge testing for some adapters. Several wireless charging pads report automatic switching among multiple wattage modes to match the connected device.