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 to14000mAh 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 with Built-in USB-C Cable, 87W Max Fast Charging (PowerCore 20K for Laptop) Lenovo, HP, Dell, Microsoft, MacBook, iPad, iPhone, Apple Watches, Samsung and More - Black

Anker Power Bank, 20,000mAh with Built-in USB-C Cable, 87W Max Fast Charging (PowerCore 20K for Laptop) Lenovo, HP, Dell, Microsoft, MacBook, iPad, iPhone, Apple Watches, Samsung and More - Black

Product ID: 643420431

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Details

Connector Type
USB Type C
Brand
Anker
Battery Capacity
20000 Milliamp
Colour
Black
Special Feature
Built In Cable

⚡87W max fast charging

🔋20,000mAh high capacity

🔌Built-in USB-C cable

Description

⚡ Stay powered, stay ahead — never miss a beat with Anker PowerCore 20K!

ALL DAY BATTERY BACKUP - 20,000mAh capacity keeps your devices powered through long workdays and travel.
MULTI DEVICE POWERHOUSE - Distribute 87W across three devices simultaneously—perfect for your full tech stack.
TRAVEL READY RELIABLE - Airline-approved battery with overcharge protection and a sleek, compact design.
POWER UP AT LIGHTNING SPEED - Charge a 14" MacBook Pro to 50% in under 40 minutes with 87W max output.
INTEGRATED CABLE CONVENIENCE - Built-in USB-C cable endures 10,000+ bends for hassle-free, on-the-go charging.

The Anker PowerCore 20K is a high-capacity 20,000mAh power bank featuring an 87W max fast charge output and a durable built-in USB-C cable. Designed for professionals on the move, it rapidly charges laptops, smartphones, and tablets simultaneously, with airline-approved safety and a compact form factor for seamless travel.

Specifications

Product Dimensions	15.8 x 2.6 x 7.4 cm; 430.91 g
Batteries	1 Lithium Metal batteries required. (included)
Item model number	A1383
Special features	Built In Cable, Digital Display, Fast Charging, Over Charging Protection
Colour	Black
Battery Power Rating	20000 Milliamp Hours
Whats in the box	Anker Power Bank (20K, 87W, Built-In USB-C Cable), welcome guide, our worry-free 12-month warranty, and friendly customer service.
Manufacturer	Anker Innovations Limited
Item Weight	431 g

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