The INIU Pocket Rocket P50 sets out to break a quiet rule of small power banks: the ones that fit a pocket charge slowly, and the fast ones weigh you down.

It holds 10,000mAh, weighs 160g and pushes 45W from its main USB-C port. That’s the output most mid-size laptops charge at, coming out of something the size of an earbuds case.

This INIU P50 review checks those claims against INIU’s own spec sheet and independent lab testing, and is blunt about the one place the spec falls off a cliff.

INIU says its TinyCell Pro cells make the P50 45% smaller than a standard 10,000mAh bank. Whatever the marketing name, the result measures 8.3 x 5.2 x 2.6cm, closer to a bar of soap than the usual phone-shaped slab.

The shape matters more than the numbers. A slab rides flat against a phone in the same pocket; the P50 sits like a pebble in a coat pocket, a handbag or the front pouch of a rucksack, and at 160g you stop noticing it’s there.

The front carries a digital percentage display rather than the usual four dots. Knowing you have 37% left, not “two dots”, changes whether you top up before a flight or risk it.

The included USB-C cable is the clever bit. It detaches, it works for charging your phone and refilling the bank, and looped through the corner it doubles as a lanyard, so the cable you forgot to pack is already attached.

Darleene’s take“It’s smaller than my magnetic bank and that one only holds half as much. The lanyard idea would survive my handbag, which is where loose cables go to disappear.”

Divide capacity by weight and the P50 carries 62.5mAh per gram, the best figure of any bank we compare it with. Anything over 50 counts as class-leading light.

The trade is thickness. At 26mm the P50 won’t lie flat against a phone in a jeans pocket the way slim slabs do; it pockets like a small purse instead. Where it lives best is a coat pocket, a bag pouch or clipped by its lanyard.

Flying with it: at roughly 37Wh the P50 sits well under the 100Wh limit most airlines use, so carry-on approval is rarely a question. Keep it in hand luggage; international dangerous-goods rules keep power banks out of checked bags, and a few airlines now limit using them mid-flight. Rules for bigger banks and airline paperwork live in our full power banks on planes guide.

Carry Rating and Value for Money carried the score to 8.5 each: 62.5mAh per gram is class-leading, and no rival at this level bundles a percentage display, a detachable cable and three years of cover.

Charging Speed landed at 7.5, not higher, because the verified 45W applies to one port at a time; the 15W shared cap is the harshest multi-port behaviour among the banks we compare it with. Cable Design took 7.0 because INIU leaves the bundled cable’s amp rating unstated, which matters for Samsung’s top speed.

The 7.9 is a strong score with a condition attached: it assumes you charge one device at a time. Score it as a two-device bank and it would lose two points.