Can I Bring a 20000mAh Power Bank on a LATAM Airlines Flight?

Updated 2026-07-25 · Power Bank Guide

If you are prepping for a trip across South America or a long-haul flight to the US, you likely have a high-capacity battery in your bag. The short answer is: Yes, you can bring a 20000mAh power bank on a LATAM Airlines flight, provided it is carried in your hand luggage and stays under the universal watt-hour limit.

Understanding the LATAM Airlines power bank rules is simple once you know how airlines view batteries. Safety regulations focus on Watt-hours (Wh), not milliamp-hours (mAh). Because lithium-ion batteries are flammable, they are strictly prohibited in checked luggage and must remain in the cabin where crew can access them in the event of a malfunction.

Capacity, Specs & Speed: What 20000mAh Really Means

When you see "20000mAh" on a box, you are looking at the charge capacity. However, airlines and safety regulators use Watt-hours (Wh) to determine if a battery is too powerful to fly. Most airlines, including LATAM, follow IATA guidelines which generally allow batteries up to 100Wh without special prior approval.

To calculate the Watt-hours of your device, use this formula: Wh = (mAh ÷ 1000) × Voltage. Since almost all portable chargers use lithium-ion cells with a nominal voltage of 3.7V, a 20000mAh bank is calculated as: (20,000 ÷ 1000) × 3.7 = 74Wh.

Because 74Wh is well under the 100Wh threshold, a 20000mAh charger is considered flight-safe. If you want a reliable, travel-ready option, the INIU 20000mAh Portable Charger (Flight-Safe) is an excellent choice. It is specifically designed to be pocket-sized and TSA/flight-safe, ensuring you don't have issues at security checkpoints.

Real-World Capacity vs. Rated Capacity

It is important to understand that you will never get the full 20,000mAh into your phone. This is due to voltage conversion and energy loss through heat. The battery cells operate at 3.7V, but USB charging happens at 5V (or higher for fast charging). This conversion, combined with circuit inefficiency, typically results in a real-world efficiency of about 60-70%.

For a typical modern smartphone with a 4,000mAh to 5,000mAh battery, a 20000mAh bank provides roughly 3 to 4 full charges. For example:

• iPhone 15/16/17: Approximately 3.5 to 4 charges.
• Samsung Galaxy S-Series: Approximately 3 charges.
• Google Pixel: Approximately 3 to 3.5 charges.

Output Watts and 22.5W Fast Charging

Capacity tells you how much energy you have; wattage tells you how fast that energy gets into your device. A standard old-school charger outputs 5W or 10W, which can take several hours to fill a phone. Modern fast chargers, like the INIU 20000mAh Portable Charger (Flight-Safe), utilize 22.5W output speeds.

At 22.5W, you are using a blend of Power Delivery (PD) and Quick Charge standards. This allows you to charge a dead phone to 50% in roughly 30-40 minutes, depending on the phone's own charging limits. While some laptops require 65W or 100W to charge effectively, 22.5W is the "sweet spot" for smartphones and tablets, providing a fast top-up without overheating the device during a flight.

Navigating LATAM Airlines Power Bank Rules

To ensure a smooth boarding process, follow these practical steps when packing your gear. First, never put your power bank in your checked suitcase. If a battery shorts out in the cargo hold, it can cause a fire that is difficult for automated systems to extinguish. Always keep it in your backpack or carry-on.

Second, ensure the capacity markings are legible on the device. Security agents may ask to see the Wh or mAh rating printed on the casing. If the text has rubbed off, they have the right to confiscate the device because they cannot verify its safety. Third, keep your power bank easily accessible during the security screening process, as some airports require you to place batteries in a separate bin.

Choosing the Right Travel Charger

When selecting a charger for international travel, look for a balance of capacity and portability. A 40,000mAh bank might seem tempting, but it often exceeds 100Wh (reaching ~148Wh), which requires special airline permission. A 20,000mAh unit is the ideal limit for most travelers.

Look for features that add value during transit. For instance, a built-in flashlight can be a lifesaver in a dark hotel room or when searching for a passport in a carry-on bag. Having a USB-C cable included in the package also reduces the number of loose wires you have to manage in your cabin bag.

FAQ

Can I charge my power bank on the plane?

Yes, as long as the aircraft seat has a functioning USB port or AC outlet. However, be aware that some airlines discourage using high-wattage chargers during takeoff and landing for safety reasons.

What happens if my power bank is over 100Wh?

If a battery is between 100Wh and 160Wh, you typically need approval from the airline. Anything over 160Wh is generally prohibited on passenger aircraft. Since a 20000mAh bank is only ~74Wh, you are well within the safe zone.

Do I need to tell the crew I have a power bank?

No, you do not need to declare a standard 20000mAh power bank to the flight crew, provided it is in your carry-on and meets the capacity limits mentioned in the LATAM Airlines power bank rules.