AsperX 15000mAh Power Bank (2-Pack) Review

The AsperX 15000mAh Power Bank twin-pack is positioned as a value-driven accessory for UK smartphone and tablet users. Each unit features a 15,000mAh capacity, offering multiple charges for standard handsets. The inclusion of USB-C input and output ensures compatibility with modern iPhone (15/16) and Android devices, while the 5V/3A output provides 'fast' charging that, while not matching the highest PD standards, is sufficient for most daily needs.

In testing, 15,000mAh typically delivers around 10,000-11,000mAh of actual usable energy after conversion losses. This is enough to charge a standard iPhone three times. The build is functional rather than luxury, and the 3A charging speed is a noticeable step up from basic 1A chargers, though it will still take several hours to fully replenish the bank itself from a wall socket.

Power banks do not 'save' energy in a traditional sense and may actually involve small efficiency losses (around 15-20%) during the chemical-to-electrical conversion. However, they allow users to charge devices during off-peak tariff hours (e.g., Octopus Economy 7 or Tracker) to use during peak times. While the savings are pennies per charge, the primary value is avoiding the need for high-wattage mains usage in emergencies.

Plug-and-play. Requires a standard USB-C or Micro-USB cable to charge the units. Note that a wall plug adapter is typically not included in these budget bundles.

Negligible. Charging one 15,000mAh bank fully costs less than 1p based on a standard UK unit price of 24.5p/kWh.