REDMI 20000mAh 18W Fast Charge Power Bank

When a single top-up isn’t enough, capacity is what counts. The REDMI 20000mAh power bank stores 20,000 mAh and supports 18 W fast charging, for $34.99. It suits long weekends, road trips and the days when the power goes out and your phone becomes your flashlight, radio and news source all at once.

What the REDMI 20000mAh power bank gives you

Capacity in mAh tells you how much charge is stored. To convert it to watt-hours, multiply by the nominal cell voltage (3.7 V) and divide by 1,000: 20,000 mAh comes to about 74 Wh.

Not all of that reaches your phone. Voltage conversion and heat take a share, as they do with every power bank. In practice, expect multiple full charges for a typical smartphone, roughly double what a 10,000 mAh bank delivers. Phones with very large batteries, such as the 10,000 mAh REDMI Note 17 Pro Max 5G, will get fewer complete refills, though still a meaningful boost.

18 W fast charging, in context

18 W is a clear step up from basic 5 W charging. It is slower than the 22.5 W output of the Xiaomi Lite bank, and far slower than the 100 W wired charging some phones support at the wall, so think of this bank as a reserve tank rather than a quick-fill station. Speed also depends on your phone’s supported charging standards and your cable.

Where 20,000 mAh earns its keep in Canada

• Cottage and camping weekends, when outlets are scarce.
• Long drives between cities, when passengers all need a charge.
• Winter storms and power outages, when keeping a phone alive matters most.
• Sharing, topping up a partner’s phone as well as your own over a weekend.

One cold-weather tip: lithium-ion batteries temporarily deliver less power when they are very cold, so keep the bank in an inside pocket rather than an outer one on a frigid day.

Recharging the bank itself

A bigger battery also takes longer to refill. Check the input specification on the product sheet and give yourself plenty of time to charge it before a trip.

Taking it on a plane

At about 74 Wh, this bank is under the 100 Wh threshold, so Canadian air-travel rules allow it in your carry-on. Power banks are never permitted in checked baggage, and it is wise to confirm your airline’s policy before departure. Higher-capacity banks are generally larger and heavier, so check the dimensions on the specification sheet if you pack light. For a broader overview, read our Canadian power bank buying guide.

REDMI 20,000 mAh or Xiaomi 10,000 mAh Lite?

Choose this bank for capacity. Choose the Xiaomi Power Bank 10000mAh 22.5W Lite ($24.99) if you want the higher 22.5 W output and only need a daily top-up. Both are in our accessories range.

At $34.99, this bank ships for $14.99 on its own, or free as part of an order over $99. Orders are processed in 1–2 business days and arrive in 3–7 business days. Unused items can be returned within 30 days of delivery, and the 1-year limited warranty from Gadget Canada covers manufacturing defects.