Best Power Bank Under £30 UK
A decent power bank under £30 can keep your phone alive through a full day out, a festival weekend, or a long train journey from London to Edinburgh. At this price point, you're choosing between compact 10000mAh models that slip into a jacket pocket and bulkier 20000mAh units that can charge a phone 3-4 times. Fast charging support (USB-C PD) is now common even at budget prices.
What to Look For
- 1Match capacity to your needs — 10000mAh charges most smartphones twice and fits in a pocket. 20000mAh charges 4-5 times but weighs 350-400g and is better suited to a bag.
- 2USB-C PD (Power Delivery) matters — look for at least 20W output to fast-charge an iPhone or Samsung. Without PD, you're stuck with slow 5W/10W charging that takes hours.
- 3Check airline rules if you travel — UK airlines allow power banks up to 100Wh (roughly 27000mAh at 3.7V) in carry-on luggage. Most under-£30 models fall well within this limit, but they must go in hand luggage, never checked bags.
- 4Passthrough charging is handy — this lets you charge the power bank and your phone simultaneously from one wall plug, useful in hotels or cafes with limited sockets.
- 5Avoid no-name brands without safety certification — reputable brands like Anker, INIU, and Baseus include overcurrent and temperature protection. Check for CE marking, which is required for sale in the UK.
Our Top Picks
Anker 325 Power Bank 20000mAh
Pros
- 20000mAh capacity charges most phones 4-5 times
- USB-C input/output with 20W Power Delivery
- MultiProtect safety system with temperature control
- 18-month Anker warranty with UK support
Cons
- Weighs around 350g — noticeably heavier than 10000mAh options
- Takes 6-8 hours to fully recharge the bank itself
The most trusted name in power banks — 20000mAh capacity with reliable 20W fast charging under £30.
INIU Power Bank 10000mAh Slim
Pros
- Ultra-slim design that fits in a jeans pocket
- USB-C 20W PD output for fast phone charging
- Built-in LED display shows exact battery percentage
- Consistently under £15 on Amazon UK
Cons
- 10000mAh only gives about 2 full phone charges
- Single USB-C port means you can't charge two devices simultaneously
Incredibly slim and light at under £15 — the best pocket-friendly power bank for daily commuters.
Baseus Power Bank 20000mAh 22.5W
Pros
- 22.5W fast charging output — slightly faster than most competitors
- Clear digital display shows remaining capacity
- Charges two devices simultaneously via USB-C and USB-A
- Compact design for a 20000mAh bank
Cons
- Brand is less established than Anker in UK retail
- Glossy finish picks up fingerprints and scratches easily
Fast 22.5W charging and a digital display at a price that regularly undercuts Anker.
Anker Nano Power Bank 10000mAh
Pros
- Integrated USB-C connector plugs directly into your phone
- Compact lipstick-tube form factor
- 30W PD output — fast enough for phones and some tablets
- No cable to forget or lose
Cons
- Built-in connector only works with USB-C devices
- 10000mAh means limited capacity for heavy users
Built-in USB-C connector means no cables needed — ideal for travel and minimalists.
Charmast 10400mAh Slim Power Bank
Pros
- Three output ports (USB-C, USB-A, Micro-USB) charge multiple devices
- Slim and lightweight at under 200g
- LED indicator for battery level
- Usually available for under £13 on Amazon UK
Cons
- Maximum 18W output — not the fastest charger in this list
- Micro-USB input port feels dated in 2026
A reliable budget pick with three output ports — useful when the whole family needs a top-up.
Editor's Note
Anker remains the gold standard for reliability in the UK power bank market, but INIU and Baseus now match them on specs at lower prices. For festival season (June-August), a 20000mAh bank is worth the extra bulk — you won't find a charging point at Glastonbury. Currys and Amazon UK regularly discount power banks during Prime Day and Black Friday, so timing your purchase can save 20-30%.