INIU Portable Charger

At 20,000mAh, INIU states this charges an iPhone 15 up to 3.6 times. As with any lithium power bank, the usable charge delivered to a device runs below the raw mAh figure once voltage conversion is accounted for; a rough rule of thumb across this category is 60 to 70% of rated capacity in real usable charge, which puts this unit's real-world output roughly in line with what the 3.6-times figure implies.

45W PD fast charging is a genuinely strong figure for this capacity and price tier, supporting PD 3.0/2.0, QC 3.0/2.0, PPS, and AFC, covering the fast-charging standards used by most current iPhones, Samsung, and other Android devices. INIU states this charges an iPhone 16 to 63% in 25 minutes, a real, meaningful fast-charge speed rather than a marketing-only number. Getting the full 45W depends on the connected device supporting a matching fast-charge standard; older or budget phones without PD or QC support will charge at a slower standard USB rate regardless of what this unit can deliver.

The built-in USB-C cable is the headline convenience feature: no separate cable to pack, lose, or forget, and INIU markets this specifically around the "grab and go" use case. The unit supports up to three devices charging simultaneously across its available ports, though as with most power banks in this class, splitting output across multiple ports at once reduces the per-port wattage well below the single-port 45W maximum; expect meaningfully slower charging on each device if all three ports are active together compared to charging one device alone.

At 11.5oz (326g) and 4.5 x 2.9 x 1.1 inches, INIU markets this as one of the smallest 20,000mAh power banks available, a genuine differentiator in a category where capacity and size usually scale together fairly predictably. The TinyCell battery technology is INIU's own branding for the higher-density cells that make this size-to-capacity ratio possible.

Input tops out at 27W, a moderate recharge speed that will take a few hours for a full recharge from empty, slower than the flagship units in this category but in line with expectations at this price point. This is not a unit built around fast self-recharge the way the Anker Prime or UGREEN 145W are; plan to recharge it overnight rather than expecting a quick top-up between uses.

Against the Anker Prime and UGREEN 145W covered elsewhere on this site, this unit trades laptop-charging capability and premium features (displays, apps, 100W-plus single-port output) for a significantly lower price and a genuinely smaller physical size at the same 20,000mAh-class capacity. For buyers who only need to fast-charge phones and small devices rather than laptops, the practical difference in daily use is smaller than the price gap suggests.

Buyers who want fast phone charging without paying flagship prices. 45W PD covers genuine fast-charging needs for phones and tablets at a fraction of the Anker Prime's price.

Anyone who hates packing a separate charging cable. The built-in USB-C cable removes one of the most common travel-charging annoyances.

Size-conscious travelers. Genuinely smaller than most 20,000mAh competitors for the same capacity.

Not for anyone needing to charge a laptop. 45W is a phone and tablet speed, not a laptop-charging speed; the UGREEN 145W or Anker Prime are the right category for that.

Not for anyone who needs a fast self-recharge. At 27W input, expect a slower recharge than the premium options in this category.