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 87W Portable Charger with Built-In USB-C Cable

Product ID: 626374621

Details

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

⚡87W total power output

🔋20,000mAh high capacity

🔌Built-in USB-C cable

¥22092

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Stay powered, stay unstoppable — your ultimate travel charging companion!

BUILT IN DURABILITY - USB-C cable endures 10,000+ bends for hassle-free, tangle-free charging.
RAPID RECHARGE CYCLE - Fully recharge the power bank in just 1.5 hours with a 65W charger.
TRAVEL READY BATTERY - 20,000mAh capacity approved for airline travel—never run out on the go.
TRIPLE DEVICE CHARGING - Simultaneously power up to 3 devices with a combined 87W output.
POWER UP AT LIGHTNING SPEED - Charge a 14" MacBook Pro to 50% in under 40 minutes with 65W peak output.

The Anker Power Bank packs a massive 20,000mAh battery with an 87W output, enabling rapid charging of laptops, smartphones, and tablets simultaneously. Featuring a built-in USB-C cable designed for durability and convenience, it recharges fully in 1.5 hours and is airline-approved, making it the perfect essential for busy professionals on the move.

Specifications

ASIN	B0CXDXP8VR
Amperage	3.25 Amps
Antenna Location	Phone
Battery Capacity	20000 milliamp_hours
Battery Cell Type	Lithium Ion
Battery Charge Time	1.5 hours
Battery Weight	288 Grams
Best Sellers Rank	40 in Mobile Phone Chargers
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	4.6 4.6 out of 5 stars (10,282)
External Testing Certification	ANATEL：02386-25-16934
Global Trade Identification Number	00194644043711
Is Electric	No
Is Product Cordless	No
Item Dimensions	15.8 x 2.6 x 7.4 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
Product Warranty	18-month
Rapid Charging Performance	50% in 40 minutes
Reusability	Rechargeable
UPC	194644043711
Unit Count	1.0 count
Voltage	5 Volts
Warranty Type	No Warranty

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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.

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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.

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¥22092

Duties & taxes included

In stock

Sold byAmazon JapanDelivered 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 Japan.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

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