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 with Built-In USB-C Cable, 87W Max Fast Charging Battery Pack, For MacBook, iPhone 17/16 Series, Samsung, Switch, and More

Product ID: 724099698

Details

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

⚡87W max fast charging

🔋20,000mAh high capacity

🔌Built-in USB-C cable

71949CFA

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Description

⚡ Power that keeps pace with your hustle

INTEGRATED USB C CABLE - No more tangled cords or forgotten cables—charge instantly with the built-in durable cable.
TRIPLE DEVICE CHARGING - Simultaneously power up to 3 devices with smart power distribution—efficiency meets convenience.
TRAVEL READY RELIABLE - Airline-approved, compact, and built to last with 10,000+ cable bends—your ultimate travel companion.
MASSIVE 20 000 M AH CAPACITY - Multiple full charges for your iPhone 17/16, Samsung, or Switch—never run out on the go.
POWER UP AT LIGHTNING SPEED - 87W output charges your MacBook to 50% in under 40 minutes—stay ahead, always.

The Anker Power Bank 20,000mAh delivers ultra-fast 87W charging with a built-in USB-C cable, capable of powering multiple devices including MacBook, iPhone 17/16 series, Samsung, and Switch. Its high-capacity battery ensures extended use, rapid recharge times, and reliable durability, making it an essential accessory for 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
Battery capacity	20000 Milliamp Hours
Best Sellers Rank	#44 in Mobile Phones & Communication Products ( See Top 100 in Mobile Phones & Communication Products ) #5 in Mobile Phone Portable Power Banks
Brand	Anker
Color	Black
Colour	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
Connector type	USB-C1+USB-A1+Built-in USB C Cable
Country of Origin	China
Customer Reviews	4.6 out of 5 stars 8,201 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 centimeters
Item Dimensions L x W x Thickness	15.8L x 7.4W x 2.6Th centimeters
Item Weight	431 g
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
Special features	Built In Cable, Digital Display, Fast Charging, Over Charging Protection, Short Circuit Protection
UPC	194644043711
Unit Count	1 Count
Voltage	5 Volts
Warranty Description	12

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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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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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Great price for an authentic product. Fast international shipping too!

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71949CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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5 days ago

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