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).

How do you calculate the watt-hour capacity of this power bank?

This power bank uses four 5,000mAh cells at 3.6V. The calculation per cell is 3.6V × 5,000mAh / 1,000 = 18Wh. Multiplied by four, the total capacity is 72Wh, which is below the 100Wh limit set by airline regulations for carry-on electronics.

Anker Prime Power Bank 20 000mah Portable Charger With 200w

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Description

⚡ Power up your hustle, anywhere, anytime!

DUAL 100 W USB C PORTS - Charge two laptops simultaneously without compromise.
SMART DIGITAL DISPLAY - Instantly monitor battery life, input, and output for total control.
COMPACT TRAVEL READY - Sleek design fits effortlessly in your bag—power meets portability.
LIGHTNING FAST RECHARGE - Refuel your power bank fully in just 75 minutes—minimal downtime.
MASSIVE 20 000 M AH CAPACITY - Power your devices multiple times on the go—stay unplugged longer.

The Anker Prime Power Bank packs a massive 20,000mAh battery with an industry-leading 200W total output via two USB-C and one USB-A port, enabling simultaneous ultra-fast charging of laptops and smartphones. Its smart digital display keeps you informed in real-time, while a rapid 100W recharge means minimal wait time. Compact and travel-friendly, it’s engineered for professionals who demand reliable, high-speed power on the move.

Specifications

ASIN	B0BYNZXFM2
Antenna Location	Phone
Battery Capacity	20000 Milliamp Hours
Battery Cell Type	Lithium Polymer
Battery Charge Time	1 Hours
Battery Weight	500 Grams
Battery capacity	20000 Milliamp Hours
Best Sellers Rank	#7,993 in Mobile Phones & Communication Products ( See Top 100 in Mobile Phones & Communication Products ) #193 in Mobile Phone Portable Power Banks
Brand	Anker
Color	black
Colour	black
Compatible Devices	Apple, Samsung, Huawei, Xiaomi, Redmi, POCO, Vivo, Oppo, Macbook
Compatible Phone Models	Apple: iPhone 16 Pro/ 16 Pro Max/ 16/ 16 Plus/ 15 Pro/ 15 Pro Max/ 15/ 15 Plus/ 14 Pro/ 14 Pro Max/ 14 Plus/ 14/ 13 Pro Max/ 13 Pro/ 13/ 12/ 12 Pro Max/ 12 Pro/ 12 mini/ SE 2022, etc Samsung: Galaxy Z Flip6/ Z Fold6/ Z Filp5/ Z Fold5/ Z Filp4/ Z Fold4/ A06/ A05s/ A05/ A55 5G/ A54 5G/ A35 5G/ A34 5G/ M54/ M53 5G/ M35/ J7 Prime/ J7/ J6/ J5/ J4; S24 FZ/ S24 Ultra/ S24+/ S24/ S23 FE/ S23 Ultra/ S23+/ …
Connector Type	USB-C2+USB-A1
Connector type	USB-C2+USB-A1
Customer Reviews	4.3 out of 5 stars 3,582 Reviews
Global Trade Identification Number	00194644130893
Item Dimensions	5.5 x 5 x 12.7 centimeters
Item Dimensions L x W x Thickness	12.7L x 5W x 5.5Th centimeters
Item Weight	544 g
Manufacturer	Anker
Mfr Part Number	A1366
Model Number	A1336
Number of Batteries	1 Lithium Metal batteries required.
Number of Items	1
Number of Outlets	3
Number of Ports	3
Other Special Features of the Product	Smart Digital Display, Short Circuit Protection, Slim, Over Charging Protection, Fast Charging, Travel, USB-C1/C2: 100W BC 1.2:5V⎓1.5A APPLE 2.4A：APPLE 5V 2.4A QC3.0：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A PD3.0：5V ⎓ 3A / 9V ⎓ 3A / 15V ⎓ 3A / 20V ⎓ 5A 100Wmax FCP：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A SCP：10V ⎓ 2.25A AFC：9V ⎓ 1.67A, USB-C1/C2: 100W Max USB-A: 65W Max Total:200W Max 【USB-C】 BC 1.2:5V⎓1.5A APPLE 2.4…
Portable	No
Power Source	Battery
Special features	Smart Digital Display, Short Circuit Protection, Slim, Over Charging Protection, Fast Charging, Travel, USB-C1/C2: 100W BC 1.2:5V⎓1.5A APPLE 2.4A：APPLE 5V 2.4A QC3.0：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A PD3.0：5V ⎓ 3A / 9V ⎓ 3A / 15V ⎓ 3A / 20V ⎓ 5A 100Wmax FCP：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A SCP：10V ⎓ 2.25A AFC：9V ⎓ 1.67A, USB-C1/C2: 100W Max USB-A: 65W Max Total:200W Max 【USB-C】 BC 1.2:5V⎓1.5A APPLE 2.4A：APPLE 5V 2.4A QC3.0：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A PD：5V ⎓ 3A / 9V ⎓ 3A/12V=3A/ 15V ⎓ 3A / 20V ⎓ 5A 100Wmax PPS：3.3V-11V ⎓ 3A FCP：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A SCP: 10V⎓2.25A AFC：9V ⎓ 1.67A 【USB-A】 BC 1.2:5V⎓1.5A APPLE 2.4A：APPLE 5V 2.4A QC3.0：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A FCP：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A SCP: 10V⎓2.25A AFC：9V ⎓ 1.67A UFCS：3.3 ~ 10V 4A (P1) SUPERVOOC：5V ⎓ 6A / 10V ⎓ 6.5A Special features Smart Digital Display, Short Circuit Protection, Slim, Over Charging Protection, Fast Charging, Travel, USB-C1/C2: 100W BC 1.2:5V⎓1.5A APPLE 2.4A：APPLE 5V 2.4A QC3.0：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A PD3.0：5V ⎓ 3A / 9V ⎓ 3A / 15V ⎓ 3A / 20V ⎓ 5A 100Wmax FCP：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A SCP：10V ⎓ 2.25A AFC：9V ⎓ 1.67A, USB-C1/C2: 100W Max USB-A: 65W Max Total:200W Max 【USB-C】 BC 1.2:5V⎓1.5A APPLE 2.4A：APPLE 5V 2.4A QC3.0：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A PD：5V ⎓ 3A / 9V ⎓ 3A/12V=3A/ 15V ⎓ 3A / 20V ⎓ 5A 100Wmax PPS：3.3V-11V ⎓ 3A FCP：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A SCP: 10V⎓2.25A AFC：9V ⎓ 1.67A 【USB-A】 BC 1.2:5V⎓1.5A APPLE 2.4A：APPLE 5V 2.4A QC3.0：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A FCP：5V ⎓ 3A / 9V ⎓ 2A / 12V ⎓ 1.5A SCP: 10V⎓2.25A AFC：9V ⎓ 1.67A UFCS：3.3 ~ 10V 4A (P1) SUPERVOOC：5V ⎓ 6A / 10V ⎓ 6.5A See more
UPC	194644130893
Unit Count	11.0 Grams
Voltage	20 Volts
Warranty Description	1 Year Warranty
Warranty Type	No Warranty

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Anker Prime Power Bank, 20,000mAh Portable Charger with 200W Output, Smart Digital Display, 2 USB-C and 1 USB-A Port Compatible with MacBook Pro/Air, iPhone 17/16 Series, Samsung, Huaiwei, Dell

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Details

Description

Specifications

Common Questions