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 (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.

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Power Bank, 20,000mAh Portable Charger, Built-in USB-C Cable, 3-Port

Product ID: 724099698

Details

Battery capacity
20000 Milliamp
Brand
Anker
Colour
Black
Connector type
USB C Cable
Special features
Built In Cable

⚡87W total power output

🔋20,000mAh high-capacity battery

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

330.50 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay charged, stay unstoppable — power that keeps pace with your hustle!

MASSIVE 20 000 M AH CAPACITY - Keep your devices running all day and beyond—perfect for back-to-back meetings or travel marathons.
POWER UP AT LIGHTNING SPEED - Distribute up to 87W across 3 devices, with a single device charging at 65W for rapid power boosts.
FAST RECHARGE LESS DOWNTIME - Recharge the power bank fully in just 1.5 hours with a 65W charger—stay powered without the wait.
TRAVEL READY AIRLINE APPROVED - Compact and lightweight at under 1 lb, this power bank is your ultimate on-the-go companion, cleared for flights worldwide.
BUILT IN USB C CABLE CONVENIENCE - No more cable hunting—integrated USB-C cable endures 10,000+ bends for reliable, tangle-free charging.

The Anker 20,000mAh Power Bank delivers a robust 87W output across three ports, including a built-in USB-C cable designed for durability and convenience. It rapidly charges devices like the MacBook Pro and iPhone 15 Pro, supports airline travel, and recharges itself in just 1.5 hours, making it an essential power solution for busy professionals on the move.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 Amps
Antenna Location	Laptop, Phone, Tablet
Battery Capacity	20000 Milliamp Hours
Battery Cell Type	Lithium Polymer
Battery Weight	288 Grams
Best Sellers Rank	#89 in Mobile Phones & Communication Products ( See Top 100 in Mobile Phones & Communication Products ) #10 in Mobile Phone Portable Power Banks
Brand	Anker
Color	Black
Compatible Devices	Laptop, Macbook, iPhone, Samsung, Huawei and More
Compatible Phone Models	iPhone 15 Series, Samsung, Switch, and More
Connector Type	USB-C1+USB-A1+Built-in USB C Cable
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (9,038)
External Testing Certification	ANATEL：02386-25-16934
Global Trade Identification Number	00194644043711
Is Electric	No
Is Product Cordless	No
Item Dimensions	15.8 x 2.6 x 7.4 centimeters
Item Dimensions L x W x Thickness	15.8L x 7.4W x 2.6Th centimeters
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, Digital Display, Fast Charging, Over Charging Protection, Short Circuit Protection
Output Wattage	87 Watts
Portable	No
Power Source	Battery
Rapid Charging Performance	52% in 30 Minutes
Reusability	Rechargeable
UPC	194644043711
Unit Count	1 Count
Voltage	5 Volts
Warranty Description	12

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How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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330.50 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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