Can this be brought on airplanes with tsa regulations?

Sure. All of Anker PowerCores have capacities that meet the requirements to be taken on airplanes as carry-on baggage, but they are not allowed to be transported in checked luggage. Please confirm with your airlines on how many power banks they allow a person to carry on, as most only allow two, and travel requirements are subject to change.

Does it support power delivery? what's the usb-c power output?

Sorry for our mistake. This PowerCore Essential 20000 supports Power IQ charging technology, which is incompatible with Power Delivery, the USB-C port is for input only and cannot be used to charge other devices. If you want to choose one with PD charging technology and use the USB-C port to charge other devices, we suggest you choose PowerCore Essential 20000 PD.

What does the green light mean? Seems to charge on blue and green.

The previous answer to this question stated that when the green light is illuminated, the charging bank will charge the connected device at 2x the speed. This is incorrect. The product feature on Amazon explains this 2 to 3 times stating that when the green light is illuminated it is charging in “trickle charge” mode. This is better for devices such as earbuds, watches, and other small battery devices. This is done so the smaller devices do not “overcharge” and possibly end up doing long term damage to the battery of the device you are charging. I will paste a description from the products feature page. Trickle-Charging Mode Trickle charging is designed to provide optimized charging to low-power devices such as earphones, Bluetooth speakers, and other accessories. To activate, press the power button twice or press and hold for 2 seconds until the LED indicator turns green.

what the difference between this and the powercore 20100 ??

This one appears to be newer (going by the Amazon message "There is a newer version of this product" on the 20100 page), has a USB-C input port, and can trickle charge "low power devices" if you double press the wheel.

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Anker Portable Charger, 325 Power Bank (PowerCore Essential 20K), 20K Battery Pack with 15W Charging, PowerIQ, 2 USB-A, 1 Micro USB, Two-Way USB-C Ports for iPhone Series, AirPods, and More（Black）

Anker Portable Charger, 325 Power Bank (PowerCore Essential 20K), 20K Battery Pack with 15W Charging, PowerIQ, 2 USB-A, 1 Micro USB, Two-Way USB-C Ports for iPhone Series, AirPods, and More（Black）

Product ID: 160103349

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Details

Connector Type
USB Type C
Brand
Anker
Battery Capacity
20000 Milliamp
Color
Black
Special Feature
Fast Charging

⚡15W Fast Charging with PowerIQ

🔋20,000mAh Ultra-High Capacity

🔌Dual USB-A Ports for Simultaneous Charging

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Description

🔋 Stay unstoppable with power that keeps pace with your hustle.

COMPACT TRAVEL READY - Slim, lightweight design with included travel pouch keeps you powered on-the-go without the bulk.
SMART 15 W FAST CHARGING - Anker’s PowerIQ and VoltageBoost tech deliver optimized, rapid charging tailored to your device.
MASSIVE 20 000 M AH BATTERY - Power through your day with over 5 full iPhone XS charges—never run low when it matters most.
CHARGE TWO DEVICES AT ONCE - Twin USB-A ports let you power your phone and earbuds simultaneously—because multitasking is a must.
VERSATILE RECHARGING OPTIONS - Recharge your power bank via USB-C or Micro USB—flexibility that fits your lifestyle and gear.

The Anker PowerCore Essential 20K is a sleek, high-capacity portable charger featuring a massive 20,000mAh lithium polymer battery, 15W fast charging with PowerIQ technology, and dual USB-A ports for simultaneous device charging. Designed for professionals on the move, it supports versatile recharging via USB-C and Micro USB inputs, ensuring your iPhone, Samsung Galaxy, AirPods, and more stay powered throughout your busiest days.

Specifications

Unit Count	1.0 Count
Item Dimensions L x W x Thickness	6.22"L x 2.93"W x 0.76"Th
Item Weight	342.5 Grams
Battery Cell Type	Lithium Polymer
Color	Black
Warranty Type	Limited
Recommended Uses For Product	Indoor/Outdoor
Compatible Devices	iPhone 15/15 Plus/15 Pro/15 Pro Max, iPhone 14/13/12 Series, Samsung Galaxy
Is Electric	No
Portable	No
Voltage	5 Volts
Power Source	Corded Electric
Amperage	2.4 Amps
Number of Ports	2
Connector Type Used on Cable	USB-C1+USB-A2
Battery Capacity	20000
Additional Features	Fast Charging

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