Portable device chargers provide a charging station or external battery for recharging mobile devices when users are away from their factory-supplied chargers. These chargers can top off a charge or supply sufficient charge until a device can be connected to its regular charger. They have universal connections for compatibility across different brands of devices. Portable chargers are most commonly used for cellphones, but also work for tablets, MP3 players, and other small mobile devices.

Batteries and battery chargers provide power and portability to electrical devices and equipment. Original equipment manufacturer (OEM) batteries can replace manufacturer-specific batteries incompatible devices such as cordless tools, lanterns, and two-way radios. Disposable, household batteries are commonly used in low-drain devices such as flashlights, remote controls, clocks, and smoke detectors. High-performance batteries provide increased capacity to handle spikes in power demand from high-drain devices such as digital cameras, thermal imagers, digital audio, drones, video game controllers, GPS equipment, and keyless entry systems. Rechargeable batteries can be used repeatedly without the need for constant replacement. Battery chargers replenish the power of depleted rechargeable batteries.