Why is my power bank providing fewer charges than expected?

The capacity reduction during charging is due to a 30% to 45% energy loss in the battery cells and conversion circuitry. Therefore, a fully charged Anker A1383 Power Bank (PowerCore 20K) offers an estimated 11,000mAh to14,000mAh to power devices.

How can I estimate the number of charges for my device?

To estimate charging cycles, use this formula:

How long does it take for the power bank to recharge?

It depends on the charger's power and the ambient temperature. The A1383 model, when using a 30W PD charger at 77°F (25°C), takes about 4.5 hours to recharge.

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Anker Power Bank, 20,000mAh Portable Charger with Built-in USB-C Cable, 87W Max Fast Charging Battery Pack, for iPhone 16/15/14/13 Series, Samsung, Switch, and More

Anker Power Bank, 20,000mAh Portable Charger with Built-in USB-C Cable, 87W Max Fast Charging Battery Pack, for iPhone 16/15/14/13 Series, Samsung, Switch, and More

Product ID: 636770769

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Details

Connector type
USB Type C
Brand
Anker
Battery capacity
20000
Colour
White
Special feature
Built In Cable

⚡87W max fast charging

🔋20,000mAh high capacity

🔌Built-in USB-C cable, 10,000+ bend lifespan

Description

🔋 Stay charged, stay ahead — power your hustle with Anker!

ALL DAY BATTERY BACKUP - 20,000mAh capacity keeps your devices powered through long workdays and travel.
TRIPLE DEVICE CHARGING - Simultaneously power up to three devices, with up to 65W dedicated to one device.
BUILT IN CABLE ZERO HASSLE - Integrated USB-C cable endures 10,000+ bends for reliable, tangle-free charging on the go.
POWER UP AT LIGHTNING SPEED - Charge a 14" MacBook Pro to 50% in under 40 minutes with 87W output.
TRAVEL READY ECO CONSCIOUS - Airline-approved and ClimatePartner certified for guilt-free power anywhere.

The Anker Power Bank delivers 87W max fast charging with a robust 20,000mAh battery and a durable built-in USB-C cable. Designed for professionals on the move, it charges multiple devices simultaneously, including MacBooks and smartphones, and is airline-approved and ClimatePartner certified for sustainable travel.

Specifications

Item Dimensions L x W x Thickness	6.2"L x 2.89"W x 1.02"Th
Item Weight	0.97 Pounds
Battery Cell Type	Lithium Polymer
Color	White
Warranty Type	Limited
Recommended Uses For Product	Outdoor
Compatible Devices	iPhone 16/15 Series, MacBook, Samsung, Switch, and More
Is Electric	No
Portable	No
Voltage	5 Volts
Power Source	Battery
Amperage	24 Amps
Number of Ports	2
Connector Type Used on Cable	USB Type C
Battery Capacity	20000 Milliamp Hours
Additional Features	Fast Charging, Built In Cable

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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Anker Power Bank, 20,000mAh Portable Charger with Built-in USB-C Cable, 87W Max Fast Charging Battery Pack, for iPhone 16/15/14/13 Series, Samsung, Switch, and More

Details

Description

Specifications

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