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 (Power Bank Capacity × 0.65) ÷ Device Battery Capacity ≈ Number of Charges. For instance, charging a 3,000mAh device using a 20,000mAh power bank would offer approximately 4.33 charges.

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.

Does this power bank support Samsung Fast Charging 2.0?

No, this power bank does not support Samsung Fast Charging 2.0.

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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

Details

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

⚡87W max fast charging

🔋20,000mAh high capacity

🔌Built-in USB-C cable

Details

Battery Capacity
20000 Milliamp
Brand
Anker
Colour
Black

Description

⚡ Stay unstoppable with power that keeps pace with your hustle.

TRIPLE DEVICE CHARGING - Distribute power across 3 devices simultaneously, with up to 65W for a single device.
AIRLINE READY POWERHOUSE - 20,000mAh capacity approved for air travel keeps you powered wherever business takes you.
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 peak power.
RAPID RECHARGE MINIMAL DOWNTIME - Fully recharge the power bank in just 1.5 hours using a 65W charger—stay ahead of your day.

The Anker PowerCore 20K is a robust 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—including MacBook Pro, iPhone 15 Pro, and Samsung devices—while supporting simultaneous charging of three devices. Its airline-approved capacity and quick recharge time make it the ultimate companion for seamless productivity anywhere.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 Amps
Antenna Location	Smartphones, Tablet, iPad, iPhone
Battery Capacity	20000
Battery Cell Composition	Lithium Ion
Battery Cell Type	Lithium Ion
Battery Charge Time	1.5 Hours
Battery Weight	288 Grams
Best Sellers Rank	#27,435 in Electronics ( See Top 100 in Electronics ) #226 in Mobile Portable Power Banks
Box Contents	Anker Power Bank (20K, 87W, Built-In USB-C Cable), welcome guide, our worry-free 12-month warranty, and friendly customer service.
Brand	Anker
Brand Name	Anker
Colour	Black
Compatible Devices	iphone
Connector Type	USB
Customer Reviews	4.3 out of 5 stars 7,007 Reviews
External Testing Certification	ANATEL：02386-25-16934
Global Trade Identification Number	00194644043711
Importer Contact Information	Valuecart Private Limited
Is Electric	No
Item Dimensions	15.7 x 7.3 x 2.6 Centimeters
Item Dimensions L x W x Thickness	13L x 10W x 5Th Centimeters
Item Type Name	powerbank
Item Weight Unit of Measure	431 g
Manufacturer	Anker Innovations Limited, Anker innovation ltd
Manufacturer Contact Information	Anker innovation ltd
Model Number	A1383
Number of Batteries	1 Lithium Metal batteries required. (included)
Number of Outlets	3
Number of Ports	3
Output Current	3.6 Amps
Packer Contact Information	Anker innovation
Portable	No
Power Source	Battery Powered
Rapid Charging Performance	87 w
UPC	194644043711
Unit Count	1 Count
Voltage	5 Volts
Warranty Description	2 - 12month warranty

Reviews

M**R

25.02.2026

P**R

18.02.2026

S**.

22.04.2026

S**Y

5.08.2025

P**R

17.12.2025

S**M

28.05.2025

A**R

24.03.2026

S**.

9.04.2026

A**A

7.09.2025

M**E

16.03.2026

D**E

16.01.2026

K**4

17.02.2025

H**K

21.04.2026

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