Mi Power Bank 3i 20000mAh with 18W Fast Charging

Overview

The Mi Power Bank 3i is a reliable companion for anyone who needs power on the go. With a massive 20000mAh capacity and 18W fast charging support, it can keep your devices powered throughout the day. Mi’s reputation for quality and affordability shines through in this product.

Design and Build

The power bank features a minimalist design with a matte black finish that resists fingerprints. The rounded edges make it comfortable to hold, though at 434g, it’s not the lightest option available. The compact form factor makes it easy to slip into a bag or backpack.

Four LED indicators on the front display the remaining battery level, giving you a quick visual reference of available charge. The build quality feels premium and durable, as expected from Xiaomi.

Capacity and Performance

With 20000mAh capacity, this power bank can:

Charge an iPhone 13 approximately 4 times
Charge a Samsung Galaxy S22 about 3.5 times
Charge wireless earbuds 15-20 times
Provide 1.5-2 full charges for tablets

The actual usable capacity is around 12400mAh (considering conversion losses), which is still excellent for the price.

Charging Speed

The 18W fast charging support is a game-changer:

Can charge compatible phones from 0-50% in about 30 minutes
Charges iPhone models at optimised speeds
Supports Quick Charge 3.0 and other fast charging protocols
Two USB-A ports allow charging two devices simultaneously

However, when charging two devices at once, the combined output is limited to 18W, so charging speeds will be divided.

Input Options

The power bank offers flexibility with dual input ports:

Micro-USB: For those with older cables
Type-C: For modern devices and faster recharging

This dual-input design means you’re never stuck without a way to recharge the power bank.

Safety Features

Mi has implemented 12-layer circuit protection, including:

Over-charge protection
Over-discharge protection
Short circuit protection
Temperature control
Over-current protection
Reset protection

These safety features ensure both your devices and the power bank remain protected during use.

Pass-through Charging

A useful feature that allows you to charge the power bank while simultaneously charging your devices. Perfect for overnight charging scenarios where you want everything powered up by morning.

Recharge Time

Recharging the 20000mAh battery takes approximately 6-7 hours with an 18W charger. Using a 10W or 5W charger will extend this time considerably. It’s recommended to use an 18W charger for optimal recharge times.

What’s in the Box

Mi Power Bank 3i 20000mAh
Micro-USB cable (no Type-C cable included)
User manual

Note: Wall charger not included.

Pros

Massive 20000mAh capacity
18W fast charging support
Dual USB outputs
Dual input options (Micro-USB & Type-C)
12-layer safety protection
Premium build quality
Pass-through charging
Excellent value for money
Reliable brand

Cons

Relatively heavy at 434g
No Type-C output port
Type-C cable not included
Takes long to fully recharge
Output split when charging two devices

Who Should Buy This?

Perfect for:

Frequent travellers
Heavy smartphone users
People who use multiple devices
Anyone who needs reliable backup power
Students and professionals on the go

Comparison with Alternatives

Compared to other 20000mAh power banks:

More affordable than branded alternatives
Better build quality than generic options
Proven reliability and safety features
Strong after-sales support from Xiaomi

Tips for Best Performance

Use an 18W charger for faster recharging
Avoid extreme temperatures during storage and use
Recharge the power bank every 3 months if not in regular use
Don’t leave it fully discharged for extended periods
Keep the ports clean and free from dust

Verdict

The Mi Power Bank 3i 20000mAh strikes an excellent balance between capacity, features, and price. It’s a reliable power solution that won’t let you down when you need it most. The 18W fast charging, dual outputs, and comprehensive safety features make it one of the best options in its price range.

Whether you’re a student, professional, or traveller, this power bank provides peace of mind knowing you’ll never run out of battery at crucial moments.

Rating: 4.6/5