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 x 0.65) + Device Battery Capacity ≈ Numberof Charges For instance, charging a 3,500mAh device using a 20,000mAh povver bank would offer approximately 3.8 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.

Power Bank 20 000mah Travel Essential Portable Charger With Built

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Description

⚡ Power your hustle, anywhere, anytime.

MASSIVE 20 000 M AH CAPACITY - Keep your devices powered all day and through flights with airline-approved, high-capacity battery backup.
SLEEK TRAVEL READY DESIGN - Slim, lightweight (under 1 lb) and perfectly sized to fit your work bag or travel case without bulk.
BUILT IN CABLE ZERO HASSLE - Integrated USB-C cable endures 10,000+ bends, eliminating cable clutter and ensuring fast, reliable charging on the go.
POWER UP AT LIGHTNING SPEED - Charge up to 3 devices simultaneously with a massive 87W output, including 65W for your MacBook Pro—50% charge in under 40 minutes.
RAPID RECHARGE MINIMAL DOWNTIME - Fully recharge the power bank in just 1.5 hours with a 65W charger—ready when you are.

The Anker Power Bank packs a powerful 20,000mAh lithium polymer battery with 87W max output across three ports, including a built-in USB-C cable designed for durability and convenience. It rapidly charges flagship devices like MacBook Pro, iPhone 15/16 series, Samsung phones, and Nintendo Switch, making it an essential travel companion for professionals who demand fast, reliable power on the move.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 Amps
Antenna Location	Outdoor
Battery Capacity	20000 Milliamp Hours
Battery Cell Type	Lithium Polymer
Battery Weight	288 Grams
Best Sellers Rank	#89 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #8 in Cell Phone Portable Power Banks
Brand	Anker
Color	Black
Compatible Devices	iPhone 16/15 Series, MacBook, Samsung, Switch, and More
Compatible Phone Models	iPhone 15 Series, Samsung, Switch, and More
Connector Type	Built-In C Cable + 1C1A
Customer Reviews	4.6 out of 5 stars 7,267 Reviews
External Testing Certification	ANATEL：02386-25-16934
Global Trade Identification Number	00194644043711
Is Electric	No
Is Product Cordless	No
Item Dimensions	6.2 x 2.89 x 1.02 inches
Item Dimensions L x W x Thickness	6.2"L x 2.89"W x 1.02"Th
Item Weight	0.95 Pounds
Manufacturer	Anker
Mfr Part Number	A1383011
Model Number	A1383
Number of Batteries	1 Lithium Metal batteries required. (included)
Number of Items	1
Number of Outlets	3
Number of Ports	3
Other Special Features of the Product	Built In Cable, Fast Charging
Output Wattage	87 Watts
Portable	No
Power Source	Battery
Rapid Charging Performance	52% in 30 Minutes
Reusability	Rechargeable
Special Feature	Built In Cable, Fast Charging
UPC	194644043711
Unit Count	1.0 Count
Voltage	5 Volts
Warranty Description	18.00
Warranty Type	Limited

Reviews

M**S

15.04.2026

M**K

26.03.2026

M**P

19.02.2026

D**R

17.03.2026

I**A

24.03.2026

R**E

23.03.2026

D**.

3.03.2026

A**L

17.04.2026

A**A

7.09.2025

E**A

3.05.2026

K**4

17.02.2025

H**K

21.04.2026

H**M

22.02.2026

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

€ 114.05

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Spain.

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Fast, free shipping, member pricing & priority support.

Join PRO →

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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3 days ago

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The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Power Bank, 20,000mAh Travel Essential Portable Charger with Built-in USB-C Cable, 3-Port 87W Max Fast Charging Battery Pack, for MacBook, iPhone 16/15 Series, Samsung, Switch, and More

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Description

Specifications

Reviews

Common Questions