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 × 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.

Does this power bank support Samsung Fast Charging 2.0?

No, this power bank does not support Samsung Fast Charging 2.0.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Anker Power Bank, 20,000mAh with Built-in USB-C Cable, 87W Max Fast Charging (PowerCore 20K for Laptop) Lenovo, HP, Dell, Microsoft, MacBook, iPad, iPhone, Apple Watches, Samsung and More - Black

Anker Power Bank, 20,000mAh with Built-in USB-C Cable, 87W Max Fast Charging (PowerCore 20K for Laptop) Lenovo, HP, Dell, Microsoft, MacBook, iPad, iPhone, Apple Watches, Samsung and More - Black

Product ID: 643420431

Details

Battery Capacity
20000
Brand
Anker
Colour
Black
Connector Type
USB
Voltage
5 Volts

⚡87W max output

🔋20,000mAh capacity

🔌Built-in USB-C cable

R181

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

Description

⚡ Stay powered, stay ahead—never miss a beat with Anker PowerCore 20K!

CABLE CLUTTER BE GONE - Integrated USB-C cable built to last 10,000+ bends means no more forgotten or tangled cables.
TRIPLE DEVICE CHARGING - Simultaneously power up to 3 devices with smart power distribution—up to 65W to a single device.
MASSIVE JUICE ON THE GO - 20,000mAh capacity delivers multiple full charges for your devices, keeping you unplugged longer.
FAST RECHARGE FAST RETURN - Recharge the power bank fully in just 1.5 hours with a 65W charger—ready when you are.
POWER UP AT LIGHTNING SPEED - 87W max output charges laptops & phones rapidly—50% MacBook Pro charge in under 40 mins.

The Anker PowerCore 20K is a high-capacity 20,000mAh power bank featuring an 87W max output for ultra-fast charging of laptops, smartphones, and tablets. It includes a durable built-in USB-C cable designed for over 10,000 bends, supports simultaneous charging of three devices with smart power distribution, and recharges fully in just 1.5 hours with a 65W charger. Ideal for professionals on the move, it ensures your devices stay powered through long workdays and travel.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 Amps
Antenna Location	Smartphones, Tablet, iPad, iPhone
Battery Capacity	20000
Battery Cell Composition	Lithium Ion
Battery Cell Type	Lithium Ion
Battery Charge Time	1.5 Hours
Battery Weight	288 Grams
Best Sellers Rank	#33,736 in Electronics ( See Top 100 in Electronics ) #288 in Mobile Portable Power Banks
Box Contents	Anker Power Bank (20K, 87W, Built-In USB-C Cable), welcome guide, our worry-free 12-month warranty, and friendly customer service.
Brand	Anker
Brand Name	Anker
Colour	Black
Compatible Devices	iphone
Connector Type	USB
Customer Reviews	4.4 out of 5 stars 7,621 Reviews
External Testing Certification	ANATEL：02386-25-16934
Global Trade Identification Number	00194644043711
Importer Contact Information	Valuecart Private Limited
Is Electric	No
Item Dimensions	15.7 x 7.3 x 2.6 Centimeters
Item Dimensions L x W x Thickness	13L x 10W x 5Th Centimeters
Item Type Name	powerbank
Item Weight Unit of Measure	0.95 Pounds
Manufacturer	Anker Innovations Limited, Anker innovation ltd
Manufacturer Contact Information	Anker innovation ltd
Manufacturer 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
Output Current	3.6 Amps
Output Wattage	87 Watts
Packer Contact Information	Anker innovation
Portable	No
Power Source	Battery Powered
Rapid Charging Performance	87 w
UPC	194644043711
Unit Count	1 Count
Voltage	5 Volts
Warranty Description	2 - 12month warranty

Common Questions

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.

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.

What is Desertcart? Is it safe to order from?+

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.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

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

3 weeks ago

Ali H.

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

1 day ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

R181

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

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

3 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

View all Trustpilot reviews