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) | 1 USB-C and 1 USB-A port, for MacBook Pro/Air, iPhone 17/16/15/14, Samsung, Switch and more

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

€ 157.28

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Stay powered, stay unstoppable — the ultimate travel essential for the modern pro.

BUILT IN USB C CABLE - Never fumble for cables again—durable, integrated USB-C cable designed for 10,000+ bends.
TRIPLE DEVICE CHARGING - Simultaneously power up to three devices with 87W total output, keeping your entire tech arsenal ready.
AIRLINE APPROVED POWERHOUSE - 20,000mAh capacity that’s TSA-friendly, so your travel game stays strong and uninterrupted.
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 your power bank in just 1.5 hours with a 65W charger—because downtime is not an option.

The Anker Power Bank packs a massive 20,000mAh lithium polymer battery with 87W total output, including a built-in USB-C cable engineered for durability. It supports rapid charging for MacBook Pro, iPhone 15 series, Samsung devices, and more, delivering up to 65W to a single device and charging three devices simultaneously. Compact and airline-approved, it fully recharges in 1.5 hours, making it the perfect companion for busy professionals on the move.

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	#126 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	4.6 4.6 out of 5 stars (8,990)
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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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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€ 157.28

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

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Received my product in pristine condition. Great service overall.

1 month ago

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