One of the most common questions from frequent travelers is whether a power bank can go in hand luggage, in checked luggage, or on the plane at all. The short answer is that power banks must travel in your carry-on bag, never in checked luggage, and their capacity must stay within the limits set by the airline and civil aviation authority. The rule is expressed in watt-hours (Wh), not milliamp-hours, which trips up many travelers because power banks are sold in mAh.
This FAQ explains how to convert mAh to Wh, what the common 100 Wh and 160 Wh thresholds mean, how the bank's labeling affects security screening, and what to do if your bank is over the limit. Rules vary slightly by airline and country, so treat this as a general guide and confirm with your carrier before flying.
Q: Why are power banks not allowed in checked luggage?
Power banks are standalone lithium-ion battery packs, and lithium batteries pose a fire risk when damaged or short-circuited in the hold. In the cargo hold there is no cabin crew to monitor a thermal event, so civil aviation authorities around the world require spare lithium batteries and power banks to be carried in the cabin where a fire can be detected immediately. Putting a power bank in checked luggage is a rule violation even if the capacity is small, and many airlines will open and remove it during baggage screening.
Q: What is the 100 Wh limit, and which banks fall under it?
The common civil aviation rule allows power banks under 100 Wh to be carried in the cabin without airline approval. Since lithium cells are rated at about 3.7 V, a 100 Wh bank corresponds to roughly 27,000 mAh of cell capacity. In practice, the vast majority of consumer power banks sold today fall well under this: 5,000, 10,000, 20,000 mAh and even many 26,800 mAh models are around 18.5 Wh, 37 Wh, 74 Wh and 99 Wh respectively. If your bank is under about 27,000 mAh, you are almost certainly inside the automatic allowance.
Q: What about banks between 100 Wh and 160 Wh?
Power banks between 100 Wh and 160 Wh generally require advance approval from the airline, and most airlines limit each passenger to two such batteries. A 160 Wh bank corresponds to about 43,000 mAh at 3.7 V. These are typically high-capacity portable power stations rather than pocket banks. If you need to carry one, contact your airline's customer service well before departure to request approval; bring the written confirmation, and expect the agent at the gate to ask for it. Banks over 160 Wh are generally not allowed on passenger flights.
Q: How do I calculate watt-hours from mAh?
Multiply the milliamp-hour rating by the cell voltage, then divide by 1,000. Most consumer lithium power banks use cells rated at 3.7 V, so the formula is Wh = mAh × 3.7 ÷ 1,000. For example, a 20,000 mAh bank is 20,000 × 3.7 ÷ 1,000 = 74 Wh, which is well under 100 Wh. A 30,000 mAh bank is 111 Wh, which falls in the approval range. If the bank's label already prints the Wh figure, use that number rather than calculating, because manufacturers sometimes use a different cell voltage.
Q: Does the bank need to be labeled?
Yes. The bank must be clearly and durably labeled with its capacity, usually in Wh or mAh and voltage. Security agents rely on the label to decide whether the bank is allowed; unlabeled or faded labels can lead to the bank being refused, even if it is technically under the limit. Zishine power banks carry permanent laser-etched labels showing cell capacity, voltage and Wh, and are supported by UN38.3 test reports, which is the documentation most carriers and forwarders expect for lithium batteries. If your label has worn off, stop carrying the bank on flights rather than arguing about the actual capacity.
Q: What about charging my devices from the bank during the flight?
Once on board, using the bank to charge a phone, earbuds or laptop during the flight is allowed on most airlines, as long as the bank stays in the cabin. Some airlines require the bank to remain stowed rather than held in the seatback, and during takeoff and landing most devices and chargers must be switched off or in flight mode. There is generally no restriction on the bank itself being switched on and charging a device during cruise, but follow the cabin crew's instructions.
Q: Can I bring multiple power banks?
Yes, as long as each individually falls under 100 Wh and the total number is reasonable. Most airlines allow each passenger several personal power banks under 100 Wh; there is no strict universal cap, but carrying a bag full of 20 identical banks will attract scrutiny and may be treated as a commercial shipment rather than personal use. For personal travel, one or two banks is typical and rarely questioned.
Q: What happens if my bank is over the limit at security?
If your bank exceeds the allowed Wh and you do not have airline approval, security will refuse it for the flight. You have three options: leave it with a friend or driver, ship it ahead, or discard it. Do not attempt to wrap it or hide it; lithium batteries in checked luggage are a serious safety violation. If this happens often on your route, consider buying a smaller bank at your destination rather than fighting the rule.
Q: Do e-bike batteries and larger power stations follow the same rule?
The same 100 Wh / 160 Wh framework applies to most lithium battery products, but high-capacity e-bike batteries and portable power stations over 160 Wh cannot be carried on passenger flights at all. Some can be shipped as cargo under dangerous-goods rules, which requires UN38.3 documentation and a specialized forwarder. If you are transporting such equipment for business, plan ahead and work with a logistics provider experienced in lithium battery cargo.
Q: How does Zishine support travelers and OEM buyers with airline-ready products?
Every Zishine power bank line is built to UN38.3 standards, with permanent capacity labeling and complete transport documentation, so consumers can travel with confidence and OEM buyers can hand their customers a product that passes security screening without argument. For brands selling into consumer markets, Zishine's engineering team can advise on capacity selection to stay under the 100 Wh threshold, and can supply MSDS, UN38.3 summaries and transport identification documents for each batch. Buyers in Indonesia, Japan, the United States and other markets routinely use this documentation to clear cross-border shipments and platform listings.
Q: Should I take the power bank out of my bag at security?
Most countries require you to place power banks and laptops in a separate tray at security screening, because lithium batteries can block the X-ray image and trigger a manual search. Put the bank in its own tray rather than leaving it deep in a backpack. If the bank is attached to a phone case, separate them so the agent can inspect both. This speeds up screening and avoids the bank being flagged for a manual check.
