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, Built-in USB-C Cable(Black)

Product ID: 627188297

Details

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

⚡87W total power output

🔋20,000mAh high-capacity battery

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

€ 136.15

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your life, anywhere, anytime — because your devices deserve the best.

BUILT IN USB C CABLE - Never fumble for cables again; integrated, durable, and travel-ready with 10,000+ bend resistance.
TRIPLE DEVICE CHARGING - Simultaneously power three devices with up to 87W output—stay connected without compromise.
AIRLINE APPROVED POWERHOUSE - 20,000mAh capacity that’s TSA-friendly—your ultimate travel companion for nonstop productivity.
POWER UP AT LIGHTNING SPEED - Charge your MacBook Pro to 50% in under 40 minutes—because waiting is so last decade.
RAPID RECHARGE IN 90 MINUTES - Fully recharge the power bank fast with a 65W charger—minimize downtime, maximize hustle.

The Anker Power Bank delivers a robust 20,000mAh capacity with an 87W total output, featuring a built-in USB-C cable designed for durability and convenience. Compatible with MacBook Pro/Air, iPhone 15/16/17 series, Samsung, Switch, and more, it supports rapid charging—50% for a 14" MacBook Pro in under 40 minutes and 58% for iPhone 15 Pro in 30 minutes. Compact, airline-approved, and equipped with both USB-C and USB-A ports, it’s engineered for professionals on the move who demand reliable, fast power anytime.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 A
Antenna Location	Outdoor
Battery Capacity	20000 milliamp_hours
Battery Cell Type	Lithium Polymer
Battery Weight	288 g
Best Sellers Rank	#118 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #8 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 4.6 out of 5 stars (8,862)
External Testing Certification	ANATEL：02386-25-16934
Global Trade Identification Number	00194644043711
Item Dimensions	6.22 x 1.02 x 2.91 inches
Item Dimensions L x W x Thickness	6.2"L x 2.89"W x 1.02"Th
Item Weight	15.2 ounces
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
Power Source	Battery
Rapid Charging Performance	52% in 30 Minutes
Reusability	Rechargeable
UPC	194644043711
Unit Count	1 Count
Voltage	5 volts
Warranty Description	18
Warranty Type	Limited

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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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€ 136.15

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

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

3 weeks ago

Ayesha M.

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

5 days ago

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