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 iPhone 17/16/15/14/13 Series, Samsung, Switch, and More

Product ID: 626374621

Details

Battery capacity
20 Milliamp
Brand
Anker
Colour
Black
Connector type
USB Type C
Special feature
Built In Cable

⚡87W max fast charging

🔋20,000mAh high capacity

🔌Built-in USB-C cable

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€ 97.68

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Stay powered, stay ahead — never miss a beat with Anker’s ultimate fast-charging companion!

TRIPLE DEVICE CHARGING - Simultaneously charge up to 3 devices with smart power distribution up to 65W per device.
DURABILITY MEETS DESIGN - Built to last with a cable rated for 10,000+ bends and a sleek, pocket-friendly form factor.
MASSIVE JUICE ON THE GO - 20,000mAh capacity powers your devices multiple times—perfect for long workdays or travel.
CABLE CLUTTER ELIMINATED - Integrated USB-C cable tucks neatly away, so you never forget your charger again.
POWER UP AT LIGHTNING SPEED - 87W peak output charges laptops & phones rapidly, hitting 50% in under 40 minutes.

The Anker 20,000mAh Power Bank delivers ultra-fast 87W charging with a built-in USB-C cable, enabling rapid power-ups for iPhones, Samsung devices, laptops, and more. Its high capacity supports multiple charges on the go, while the integrated cable and multiple ports offer unmatched convenience and versatility for busy professionals. Compact yet robust, it’s engineered for durability and designed to keep you connected wherever work or life takes you.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 Amps
Antenna Location	Phone
Battery Capacity	20 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Charge Time	1.5 Hours
Battery Weight	288 Grams
Best Sellers Rank	27 in Mobile Phone Portable Power Banks
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
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (7,108)
External Testing Certification	ANATEL：02386-25-16934
Global Trade Identification Number	00194644043711
Is Electric	No
Item Dimensions	15.7 x 7.3 x 2.6 centimetres
Item Dimensions L x W x Thickness	15.7L x 7.4W x 2.6Th centimetres
Item Weight	0.95 Pounds
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
Rapid Charging Performance	50% in 40 minutes
Reusability	Rechargeable
UPC	194644043711
Voltage	5 Volts
Warranty Type	No Warranty

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