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.

ASIN	B0CXDXP8VR
Batteries	1 Lithium Metal batteries required. (included)
Best Sellers Rank	#77 in Mobile Phones & Communication Products ( See Top 100 in Mobile Phones & Communication Products ) #17 in Mobile Phone Portable Power Banks
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (5,788)
Date First Available	21 October 2024
Item Weight	431 g
Item model number	A1383
Product Dimensions	15.75 x 7.35 x 2.6 cm; 430.91 g
Special features	Built In Cable, Digital Display, Fast Charging, Over Charging Protection, Short Circuit Protection

Anker Power Bank, 20,000mAh Portable Charger with Built-In USB-C Cable, 87W Max Fast Charging Battery Pack, For MacBook, iPhone 17/16 Series, Samsung, Switch, and More

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