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 Travel Essential, Built-in USB-C Cable | 1 USB-C and 1 USB-A port, for MacBook Pro/Air, iPhone 17/16/15/14, Samsung, Switch and more

Product ID: 626374621

Details

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

⚡87W total power output

🔋20,000mAh high capacity

🔌Built-in USB-C cable

432.35 DT

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay unstoppable, stay connected—power your hustle anywhere!

TRIPLE DEVICE CHARGING - Simultaneously power three devices with a combined 87W output—never leave a device behind.
BUILT IN CABLE CONVENIENCE - Integrated USB-C cable endures 10,000+ bends for hassle-free, on-the-go charging.
AIRLINE APPROVED POWERHOUSE - 20,000mAh capacity keeps you powered through flights and long workdays without worry.
POWER UP AT LIGHTNING SPEED - Charge a 14" MacBook Pro to 50% in under 40 minutes with up to 65W output.
RAPID RECHARGE IN 90 MINUTES - Fully recharge your power bank quickly with a 65W charger—ready when you are.

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. Perfect for professionals on the move, it rapidly charges laptops and smartphones alike, supports airline travel, and recharges fully in just 1.5 hours, ensuring you never miss a beat.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 Amps
Antenna Location	Phone
Battery Capacity	20000 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Charge Time	1.5 Hours
Battery Weight	288 Grams
Best Sellers Rank	19 in Mobile Phone Portable Power Banks
Brand Name	Anker
Colour	Black
Compatible Devices	Laptop, Mobile phones: iPhone 17 series, iPhone 16 series, iPhone 15 series, iPhone 14 series, iPhone 13 series, iPhone 12 series, Smartphone, Tablet
Compatible Phone Models	Audiovox CDM3000
Connector Type	USB Type C
Country of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (9,192)
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 centimetres
Item Dimensions L x W x Thickness	15.7L x 7.4W x 2.6Th centimetres
Item Weight	0.95 Pounds
Manufacturer	Anker
Manufacturer Part Number	A1383011
Model Number	A1383
Number of Batteries	1 Lithium Metal batteries required. (included)
Number of Items	1
Number of Ports	3
Other Special Features of the Product	Built In Cable, Digital Display, Fast Charging, Over Charging Protection
Output Current	1 Amps
Output Wattage	87 Watts
Portable	No
Power Source	Corded Electric
Product Warranty	18-month
Rapid Charging Performance	50% in 40 minutes
Reusability	Rechargeable
UPC	194644043711
Unit Count	1.0 count
Voltage	5 Volts
Warranty Type	No Warranty

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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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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432.35 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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