INIU 20000mAh Power Bank (22.5W Fast Charging) Review

The INIU 22.5W Power Bank is positioned as one of the 'smallest' 20,000mAh units on the market. It features a digital percentage display rather than vague LED pips, which allows for better management of remaining juice. With its 22.5W output, it supports fast-charging protocols for the latest iPhone and Samsung models, and its USB-C 'In & Out' port simplifies the cable clutter typically found in older portable chargers.

In testing, a 20,000mAh unit typically delivers around 13,000-14,000mAh of actual usable charge after energy conversion losses. This is enough to charge a standard iPhone 15 roughly 3.5 to 4 times. The inclusion of a detachable or built-in USB-C cable (depending on the specific sub-model selected) is a massive convenience win, though the 22.5W speed is better suited for phones than laptops, which would require the 45W variant.

Using a power bank does not reduce your total energy consumption; in fact, the conversion process during charging and discharging is roughly 80-90% efficient, meaning a slight net loss of electricity. However, it offers financial protection. By charging this at home on a standard UK flat rate (approx. 24.5p/kWh), a full charge costs less than 2p. This allows you to avoid 'convenience charging' at stations or trains which are often broken or require premium payments, and provides a buffer during power cuts.

No installation required. It is recommended to charge the unit fully using a high-quality UK wall plug (not included) before first use to calibrate the digital display.

Negligible. Based on current UK energy price caps, fully charging this device 100 times would cost roughly £2.00 in electricity.