Anker A1383 PowerCore 20K 20000mAh power bank

Everyday carry power

The Anker A1383 PowerCore 20K is a 20000 mAh portable charger built for professionals and travellers who need reliable backup for laptops, phones and handheld consoles. Its compact black housing measures 6.2 by 2.89 by 1.02 inches and weighs 15.5 ounces, so it fits in a day bag without adding bulk. The integrated USB-C cable removes the need to carry a separate lead for the most common modern devices. Two additional USB-C ports and one USB-A port let you charge three items at once.

Built-in cable and multi-port layout

The tethered USB-C cable is fixed to the body, reducing the chance of lost or forgotten cords during daily commutes. All three output ports share the 87 W maximum fast-charging budget, so a MacBook can draw high power while a phone and a Switch top up simultaneously. The 5 V 3 A input rating means the bank itself recharges from a standard PD source without proprietary adapters. Rubberised edges protect the casing from knocks when the unit is tossed into a backpack.

Efficient discharge and recharge cycle

Internal conversion losses of 30 to 45 percent leave an effective 11000 to 14000 mAh for connected devices, matching the supplier’s 0.65 derivation factor. A 3000 mAh phone therefore receives roughly 4.33 full charges from a full bank. Recharging the power bank at 25 °C with a 30 W PD charger takes about 4.5 hours, keeping downtime low between trips. The lithium metal cell operates at 5 V output with no fan, so operation stays silent in quiet environments.