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 Prime 20,000mAh Power Bank offers an estimated 11000mAh to 14000mAh to power devices.

How can I estimate the number of charges for my device?

To estimate charges, use this formula: (Power Bank Capacity × 0.65) ÷ Device Battery Capacity. For example, an iPhone 15 with a 3,877mAh battery can receive about 3.3 charges from a 20,000mAh power bank (calculated as (20,000mAh × 0.65) ÷ 3,877mAh).

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Anker Prime Power Bank, 20,000mAh 200W Portable Laptop Charger for Travel, TSA-Approved, Smart Digital Display, 2 USB-C and 1 USB-A Port, for iPhone 16/15/14 Series, Samsung, MacBook, and More

Anker Prime Power Bank, 20,000mAh 200W Portable Laptop Charger for Travel, TSA-Approved, Smart Digital Display, 2 USB-C and 1 USB-A Port, for iPhone 16/15/14 Series, Samsung, MacBook, and More

Product ID: 546010152

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Details

Connector Type
Brand
Anker
Battery Capacity
20000 Milliamp
Color
Golden
Special Feature
Digital Fast

⚡200W peak output

📊Smart digital display

⏱️100W recharge in 75 mins

Description

⚡ Power up your hustle, anytime, anywhere.

RAPID 100 W RECHARGE - Fully power up the bank in just 1 hour 15 minutes and never miss a beat on the go.
COMPACT TRAVEL READY - Sleek 5x2 inch design fits effortlessly in your bag for power wherever work or wanderlust takes you.
UNIVERSAL COMPATIBILITY - Seamlessly charges iPhone, Samsung, MacBook, Dell, and more with 2 USB-C and 1 USB-A ports.
REAL TIME BATTERY INSIGHTS - Smart digital display keeps you informed with precise battery, input, and output stats—control at your fingertips.
BLAZING 200 W POWER DELIVERY - Charge your iPhone 16 Pro to 30% in just 15 minutes—because every second counts.

The AnkerPrime 20,000mAh power bank delivers an impressive 200W total output through 3 ports, enabling ultra-fast charging for laptops and smartphones alike. Its 100W rapid recharge capability means minimal downtime, while the smart digital display provides real-time battery and power data. Compact and TSA-approved, it’s the perfect travel companion for professionals who demand reliable, high-speed power on the move.

Specifications

Antenna Location	PC, Phone
Warranty Type	Limited
Item Weight	1.2 Pounds
Item Dimensions L x W x Thickness	5"L x 2.15"W x 1.96"Th
Color	Golden
Battery Cell Type	Lithium Ion
Battery Capacity	20000
Power Source	Corded Electric
Voltage	20 Volts
Portable	Yes
Amperage	24 Amps
Compatible Devices	iPhone 16/15/14/13 Series, Samsung, MacBook, Dell, and More
Connector Type Used on Cable	USB-C2+USB-A1
Number of Ports	3
Additional Features	Fast Charging

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