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.

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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

Product ID: 627188297

Details

Battery Capacity
20000 Milliamp
Brand
Anker
Color
Black
Connector Type
Built-In C +
Special Feature
Built In Cable

⚡87W max power output

🔋20,000mAh high capacity

🔌Built-in USB-C cable

$154.66

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Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your hustle anywhere, anytime — never miss a beat!

UNIVERSAL COMPATIBILITY - Seamlessly powers MacBook, iPhone 15/16, Samsung, Switch & more 🌍
RAPID RECHARGE RAPID USE - Fully recharge the power bank in just 1.5 hours with 65W charger ⏱️
MASSIVE 20 000 M AH CAPACITY - Stay unplugged longer with airline-approved, high-capacity battery 🔋
BUILT IN USB C CABLE CONVENIENCE - No more cable hunting—durable cable withstands 10,000+ bends 🔌
POWER UP TRIPLE DEVICES SIMULTANEOUSLY - Distribute up to 87W across 3 ports, with 65W single-device turbocharge ⚡

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 engineered for durability. It rapidly charges flagship devices like MacBook Pro and iPhone 15 series, supports simultaneous multi-device charging, and recharges itself in just 1.5 hours. Compact and airline-approved, it’s the ultimate travel essential for busy professionals 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	#177 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #16 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 8,569 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

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Are the products genuine and authentic?+

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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$154.66

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Best international shipping I've ever tried. Worth every penny!

3 days ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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