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 Nano Power Bank offers an estimated 2,750mAh to 3,500mAh 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 5,000mAh power bank would offer approximately 1.08 charges.

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621 Power Bank with Built-in Lightning Connector, MFi Certified, Battery Pack 5,000mAh 12W, Compatible with iPhone 15/15 Pro / 15 Plus / 15 Pro Max, iPhone 14 and 13 Series (Black)

Product ID: 544569842

Details

Battery capacity
5000 Milliamp
Brand
Anker
Colour
Black
Connector type
Lightning*1

⚡12W Fast Charging

🔋5000mAh Battery Capacity

🔌Built-in Lightning Connector

R873

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

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Description

⚡ Power your hustle, cable-free and worry-free!

COMPACT YET MIGHTY - Slim, pocket-sized design packs a powerful 5000mAh punch—perfect for professionals always on the move.
POWER UP IN A FLASH - 12W output delivers rapid charging so you never miss a beat during your busy day.
APPLE APPROVED SAFETY - MFi certification guarantees seamless compatibility and safe charging for your iPhone 15/14/13 series.
CABLE FREE CONVENIENCE - Integrated Lightning connector means no more tangled cables—charge your iPhone on the go with zero hassle.
EXTENDED ENTERTAINMENT - Boost your iPhone 14 Pro Max with up to 20 extra hours of video playback—stay connected and entertained anywhere.

The Anker 621 Power Bank is a sleek, MFi-certified 5000mAh battery pack with a built-in Lightning connector, delivering 12W fast charging for iPhone 15, 14, and 13 series. Its compact design fits perfectly in your pocket, providing up to 20 hours of extra video playback, making it the ultimate on-the-go power solution for busy professionals.

Specifications

ASIN	B0BV5YV836
Antenna Location	Outdoor
Battery Capacity	5000 Milliamp Hours
Battery Cell Type	Lithium Ion
Battery Charge Time	20 Hours
Battery Weight	10 Grams
Best Sellers Rank	#1,865 in Mobile Phones & Communication Products ( See Top 100 in Mobile Phones & Communication Products ) #76 in Mobile Phone Portable Power Banks
Brand	Anker
Color	Black
Compatible Devices	Apple, Samsung, Huawei, Xiaomi, Redmi, POCO, Vivo, Oppo
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-C1+Bulit-in Lightning1
Country of Origin	China
Customer Reviews	3.9 3.9 out of 5 stars (5,509)
Global Trade Identification Number	00194644124922
Item Dimensions	7.7 x 3.7 x 2.5 centimeters
Item Dimensions L x W x Thickness	10L x 3W x 13Th centimeters
Item Weight	100 g
Manufacturer	Anker
Mfr Part Number	A1645011
Model Number	A1645
Number of Batteries	1 Lithium Polymer batteries required. (included)
Number of Items	1
Number of Ports	2
Other Special Features of the Product	Built-In Lightning Connector, Short Circuit Protection, Slim, Over Charging Protection, Fast Charging, Travel, Built-In Lightning Port: 5V⎓2.4A, USB-C: 5V⎓3A
Portable	No
Power Source	Battery
UPC	194644124922
Unit Count	1 Count
Voltage	5 Volts
Warranty Description	Limited
Warranty Type	Limited

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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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R873

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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