Power banks keep phones, tablets and small essentials charged on the go and during short outages. High-capacity USB-C models can even top up laptops and are a low-cost emergency backup.
Why power banks matter
In a power cut, a charged phone is your lifeline for updates and help. A quality power bank is inexpensive insurance and useful every day, not just in emergencies.
Recommended products
Filter our reviews to match your home and priorities.
INIU
INIU 20000mAh Power Bank (22.5W Fast Charging)
A high-capacity, flight-safe portable charger designed for fast-charging modern smartphones and small electronics on the go.
Ultra-slim 20,000mAh capacity provides multiple full charges for standard UK smartphones.
Read Review
AsperX
AsperX 15000mAh Power Bank (2-Pack)
A high-capacity dual-pack of portable chargers designed to keep mobile devices powered on the move via USB-C and USB-A ports.
Double-pack convenience for multi-user households or travel redundancy.
Read Review
Anker
Anker Zolo Power Bank (20,000mAh, 30W High-Speed)
A high-capacity 20,000mAh portable charger with an integrated USB-C cable, designed for fast-charging modern smartphones and tablets.
Integrated cable eliminates the need for carrying extra leads.
Read Review
Karlayer
Karlayer 10000mAh Magnetic Wireless Portable Charger
A budget-friendly 10,000mAh MagSafe-compatible power bank designed for modern iPhone users seeking a compact, snap-on backup battery.
Convenient cable-free magnetic charging for iPhone 12 to 17 series.
Read Review
Einhell
Einhell Power X-Change USB Power Bank Adaptor TC-CP 18 Li USB
Practical adaptor that transforms any Einhell Power X-Change battery into a high-capacity power bank for charging mobile devices.
Leverages existing tool batteries for versatile off-grid charging
Read Review
IGGPBB
IGGPBB 26800mAh Portable Fast Charging Power Bank
A high-capacity portable battery featuring built-in cables and multi-device charging, designed to keep mobile devices powered during long commutes or travel.
All-in-one charging with integrated USB-C and Lightning cables.
Read ReviewBuying advice
Look at real usable capacity
Advertised mAh overstates real output — check the rated Wh and how many phone charges it delivers.
Prioritise USB-C Power Delivery
PD models charge faster and can power larger devices like laptops.
Keep one charged
A backup battery only helps if it's topped up — recharge it periodically.
Frequently asked questions
Do power banks actually save money on energy bills?
They can, when they solve a real problem in your home. Our reviews focus on the products that make a measurable difference rather than novelty gadgets, and each one explains when the savings justify the cost — and when they don't.
Does PowerGuardian sell power banks?
No. PowerGuardian is an independent UK energy information service. Some links are Amazon affiliate links and we may earn a small commission at no extra cost to you, but our reviews and ratings always stay advice-led and independent.
How does PowerGuardian rate power banks?
Every review is scored across six dimensions — Energy Saving, Ease of Use, Value, Features, Installation and Reliability — which combine into an overall PowerGuardian Rating out of 5. See our methodology for full detail.