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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Anker 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 max output for ultra-fast charging

🔋20,000mAh capacity for extended power

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

85350CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Power your hustle, anywhere, anytime.

TRIPLE DEVICE CHARGING - Simultaneously power up to three devices with a combined 87W output, sharing power where you need it most.
FAST RECHARGE LONG LASTING - Recharge the power bank fully in just 1.5 hours with a 65W charger, so you’re always ready for your next adventure.
POWER UP AT LIGHTNING SPEED - Charge your MacBook to 50% in under 40 minutes and iPhone 15 Pro to 58% in just 30 minutes.
TRAVEL READY AIRLINE APPROVED - Compact 20,000mAh battery pack fits perfectly in your bag and is approved for air travel—never run out of juice on the go.
BUILT IN USB C CABLE CONVENIENCE - Say goodbye to tangled cables with a durable, integrated USB-C cable designed to withstand over 10,000 bends.

The Anker Power Bank packs a powerful 20,000mAh lithium polymer battery with an 87W max output distributed across three ports, including a built-in USB-C cable engineered for durability. Designed for professionals on the move, it rapidly charges devices like MacBook Pro, iPhone 15/16 series, Samsung phones, and Nintendo Switch. Compact, airline-approved, and quick to recharge, it’s the ultimate travel essential for uninterrupted productivity.

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	#106 in Cell Phones & Accessories ( See Top 100 in Cell Phones & Accessories ) #7 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	4.5 4.5 out of 5 stars (9,695)
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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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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TrustScore 4.5 | 7,300+ reviews

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85350CFA

Duties & taxes included

In stock

Sold byAmazon SenegalDelivered 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 Senegal.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

2 days ago

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Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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