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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Anker Power Bank, 20,000mAh Portable Charger with Built-in USB-C Cable, 87W Max Fast Charging Battery Pack, for iPhone 16/15/14/13 Series, Samsung, Switch, and More

Anker Power Bank, 20,000mAh Portable Charger with Built-in USB-C Cable, 87W Max Fast Charging Battery Pack, for iPhone 16/15/14/13 Series, Samsung, Switch, and More

Product ID: 636770769

Details

Battery capacity
20000
Brand
Anker
Colour
White
Connector type
USB Type C
Special feature
Built In Cable

⚡87W max output for ultra-fast charging

🔋20,000mAh high-capacity battery

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

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Description

🔋 Stay powered, stay unstoppable — the ultimate fast-charging sidekick.

CABLE CLUTTER NEVER AGAIN - Integrated USB-C cable with 10,000+ bend durability means you’re always ready to charge without hunting for cords.
MASSIVE JUICE ALL DAY LONG - 20,000mAh capacity powers your devices multiple times—perfect for long workdays or weekend getaways.
POWER UP AT LIGHTNING SPEED - 87W max output charges laptops and phones rapidly—50% MacBook Pro charge in under 40 minutes.
SMART MULTI DEVICE CHARGING - Distribute power across three devices simultaneously, with up to 65W to a single device for peak performance.
SLEEK DURABLE TRAVEL READY - Compact design fits easily in your bag or pocket, airline-approved, with a bright digital battery display for instant status.

The Anker 20,000mAh Power Bank delivers an impressive 87W max output with a built-in USB-C cable engineered for over 10,000 bends, enabling rapid charging of multiple devices including iPhone 16/15/14 series, Samsung phones, and laptops. Its high-capacity battery supports extended use and quick recharge times (1.5 hours), all packed in a sleek, travel-friendly design with a clear digital battery indicator.

Specifications

ASIN	B0CXDMYS8C
Amperage	24 Amps
Antenna Location	Phone
Battery Capacity	20000
Battery Cell Type	Lithium Ion
Battery Charge Time	1.5 Hours
Battery Weight	288 Grams
Best Sellers Rank	28 in Mobile Phone Portable Power Banks
Brand Name	Anker
Colour	White
Compatible Devices	Smartphone, iPhone 16 Series, iPhone 15 Series, iPhone 17/iPhone 17 Pro/iPhone 17 Pro Max/iPhone Air
Compatible Phone Models	Audiovox CDM3000
Connector Type	USB Type C
Customer Reviews	4.5 4.5 out of 5 stars (7,201)
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	0.97 Pounds
Manufacturer	Anker
Manufacturer Part Number	A1383021
Model Number	A1383
Number of Batteries	1 Lithium Metal batteries required. (included)
Number of Items	1
Number of Ports	2
Other Special Features of the Product	Built In Cable, Digital Display, Fast Charging, Over Charging Protection
Portable	No
Power Source	Corded Electric
Reusability	Rechargeable
UPC	194644043728
Voltage	5 Volts
Warranty Type	No Warranty

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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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VT31731

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In stock

Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Vanuatu.

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