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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Anker 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 peak power output

🔋20,000mAh high-capacity battery

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

¥18443

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

BUILT IN USB C CABLE - Never fumble for cables again—durable, flexible, and always ready to juice your iPhone or MacBook.
TRIPLE DEVICE CHARGING - Distribute 87W across three devices simultaneously, keeping your entire tech squad powered up.
AIRLINE APPROVED POWERHOUSE - 20,000mAh capacity that’s TSA-friendly, so your travel essentials never run dry.
POWER UP AT LIGHTNING SPEED - Charge a 14" MacBook Pro to 50% in under 40 minutes—because waiting is so last decade.
RAPID RECHARGE IN 1 5 HOURS - Get back to full power faster than your coffee break with a 65W charger.

The Anker 20,000mAh Power Bank delivers a robust 87W output with the convenience of a built-in USB-C cable, enabling rapid charging for laptops, smartphones, and tablets. Designed for professionals on the move, it supports simultaneous charging of three devices, recharges fully in just 1.5 hours, and meets airline safety standards, making it the ultimate travel essential for uninterrupted productivity.

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
Battery capacity	20000 Milliamp Hours
Best Sellers Rank	14 in Mobile Phone Portable Power Banks
Brand	Anker
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
Connector type	USB Type C
Country of Origin	China
Customer Reviews	4.6 out of 5 stars 9,335 Reviews
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	431 g
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
Special feature	Built In Cable, Digital Display, Fast Charging, Over Charging Protection
UPC	194644043711
Unit Count	1.0 count
Voltage	5 Volts
Warranty Type	No Warranty

Common Questions

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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.

How long does delivery take and is it reliable?+

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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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

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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TrustScore 4.5 | 7,300+ reviews

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Received my product in pristine condition. Great service overall.

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¥18443

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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