How many times can it charge a phone?

With 20,000 mAh it holds roughly four to five full charges for a typical phone, less if you charge several devices at once.

Can it charge a tablet?

Yes, through either USB-C port, but at 20 W a tablet charges slowly compared with its own wall charger.

Does it come with a cable?

Yes, a 1 ft USB-C to USB-C cable is included in the box.

How do I check the battery level?

The LED digital display shows the remaining charge as a percentage.

Can it charge three devices at once?

Yes, the two USB-C ports and one USB-A port can run at the same time, though output is shared.

Is it allowed in carry-on luggage?

Yes. At 20,000 mAh it is under the 100 Wh limit most airlines set for carry-on batteries, but it must stay in the cabin, not checked baggage.

Where is the onn 20,000 mAh Portable Power Bank cheapest?

At Walmart, for $17.88, as of our latest check.

onn 20,000 mAh Portable Power Bank

Best price now

$17.88at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

onn 20,000 mAh Portable Power Bank

Best price now

$17.88at WalmartChecked Nov 10

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $17.88 at Walmart on Nov 10.

Our take on the onn 20,000 mAh Portable Power Bank

The onn 20,000 mAh Portable Power Bank is a high-capacity battery pack for phones, tablets and earbuds. It has two USB-C ports and one USB-A port with 20 W output, so up to three devices can charge at once. An LED digital display shows the remaining charge. It suits travelers, commuters and anyone who needs several days of backup power, and it competes with other 20,000 mAh packs on port count and a charge readout rather than on fast-charging speed.

Best forTravelers and commuters away from outletsCharging a phone, earbuds and a tablet at oncePeople who want to see remaining charge at a glanceMulti-day trips and emergency backup

Pros

20,000 mAh capacity gives several phone charges
Two USB-C ports plus one USB-A port
Charges up to three devices at the same time
LED digital display shows battery level
USB-C to USB-C cable included

Cons

20 W output is modest for fast charging
Large capacity means a heavier, bulkier pack
Only one USB-A port for older cables

onn 20,000 mAh Portable Power Bank prices at every store

WalmartNew
In stock
$17.88Checked Nov 10
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What reviewers say

4.6 / 51,064 ratings

Rated 4.6 out of 5 from 1,064 ratings, the pack is well received for its capacity and the charge display. Buyers treat it as a dependable backup battery rather than a fast charger.

What people mention

CapacityPraisedBuyers say it carries enough power for several phone charges before it needs recharging.
Charge displayPraisedThe LED percentage readout is called handy for knowing how much power is left.
PortsPraisedTwo USB-C ports and a USB-A port let owners charge several devices together.
Charging speedMixedSome say 20 W is fine for phones but slow for tablets and larger devices.
SizeCriticisedOwners note the 20,000 mAh body is heavy and takes up space in a bag.

About the onn 20,000 mAh Portable Power Bank

The onn 20,000 mAh Portable Power Bank holds backup power for charging USB-powered devices when you're away from an outlet. It is designed for smartphones, tablets, earbuds, and other USB-powered devices.

It has a 20 W output across two USB-C ports and one USB-A port, so it can charge up to three devices at the same time. An LED digital display shows the remaining battery level.

A 1 ft USB-C to USB-C charging cable is included in the box.

Capacity: 20,000 mAh
Output: 20 W
Ports: 2 x USB-C, 1 x USB-A
Simultaneous charging: Up to 3 devices
Display: LED digital battery level display
Color: Black
Compatibility: Smartphones, tablets, earbuds, and other USB-powered devices
In the box: Power bank, 1 ft USB-C to USB-C charging cable

Specifications

multipack_quantity: 1Source
color: BlackSource
size: 20,000 mAhSource

Questions and answers

How many times can it charge a phone?: With 20,000 mAh it holds roughly four to five full charges for a typical phone, less if you charge several devices at once.
Can it charge a tablet?: Yes, through either USB-C port, but at 20 W a tablet charges slowly compared with its own wall charger.
Does it come with a cable?: Yes, a 1 ft USB-C to USB-C cable is included in the box.
How do I check the battery level?: The LED digital display shows the remaining charge as a percentage.
Can it charge three devices at once?: Yes, the two USB-C ports and one USB-A port can run at the same time, though output is shared.
Is it allowed in carry-on luggage?: Yes. At 20,000 mAh it is under the 100 Wh limit most airlines set for carry-on batteries, but it must stay in the cabin, not checked baggage.
Where is the onn 20,000 mAh Portable Power Bank cheapest?: At Walmart, for $17.88, as of our latest check.
What do buyers say about the onn 20,000 mAh Portable Power Bank?: Rated 4.6 out of 5 from 1,064 ratings.