Liquid Rules and Battery or Power Bank Rules at Hong Kong International Airport
Standard Liquid Restrictions
All liquids, aerosols and gels in hand baggage must be in containers no larger than 100ml and packed in a transparent re-sealable plastic bag with a capacity of 1 litre or less. Only one plastic bag per passenger is permitted.
Key points:
Each container must be 100ml or less (containers larger than 100ml won't be accepted, even if only partially filled)
All containers must fit comfortably in the bag, which should close completely
Typically, a 1-litre bag can fit about five 100ml containers
The plastic bag must be presented separately at security screening
Smart Security System Update
Starting from July 2024, Hong Kong International Airport began introducing smart security screening channels with advanced 3D CT-based X-ray technology. Passengers using the new smart security screening channels can keep their electronic devices and liquids in their carry-on luggage without having to take them out for screening. However, the 100ml container limit still applies.
Note: The smart system rollout is happening in phases. Not all security lanes may have this technology yet, so be prepared to remove liquids if directed.
Exemptions
The following can be carried in quantities above 100ml, subject to verification:
Medications essential for travel (such as diabetic kits)
Baby food in paste or liquid form (when travelling with an infant)
Expressed breast milk (whether travelling with baby or not)
Special dietary requirements
Duty-Free Purchases
Liquids purchased at airports implementing liquid control requirements or on Hong Kong-registered aircraft can exceed 100ml if packed in sealed tamper-evident plastic bags with proof of purchase displayed. However, if you're transferring through Hong Kong airport, these may need to be rescreened.
Battery and Power Bank Rules
Critical Updates for 2025-2026
Important: As of April 7, 2025, Hong Kong's Civil Aviation Department implemented stricter power bank regulations. The use of lithium battery power banks to charge other portable electronic devices during flight is prohibited, and passengers are not allowed to stow power banks in overhead compartments. Power banks must be kept on your person, in the seat pocket, or in hand luggage under the seat.
General Battery Rules
Spare batteries and power banks:
Must NOT be placed in checked baggage
Must be carried in hand luggage or on your person
Must be clearly labelled with capacity rating
Power banks with unclear markings may be refused
Capacity Limits:
Up to 100Wh: Generally allowed without special approval (most consumer devices fall under this)
100-160Wh: May require airline approval
Over 160Wh: Not permitted on passenger aircraft
To calculate Watt-hours: Wh = (mAh ÷ 1000) × Voltage
For example, a 20,000mAh power bank at 3.7V = 74Wh (permitted)
Batteries in Devices
Installed batteries in electronic devices:
Up to 15 devices with lithium batteries up to 100Wh can be carried in checked baggage (must be completely switched off)
Devices must be protected from damage
Damaged, defective, or recalled batteries are prohibited
Special Restrictions
Banned items:
E-cigarettes and vapes must be in hand luggage (not checked baggage)
Small vehicles powered by lithium batteries (hoverboards, e-scooters, etc.) are completely prohibited in both checked and cabin baggage
Smart luggage with non-removable lithium batteries (unless batteries are 0.3g lithium metal or 2.7Wh lithium-ion or less)
Practical Tips
Arrive early: Allow at least 3 hours before departure to complete check-in and security screening
Prepare your liquids: Have your 1-litre plastic bag ready and accessible
Pack smart: Put all spare batteries and power banks in hand luggage, not checked bags
Label clearly: Ensure power banks show their capacity rating
Check airline policies: Individual airlines may have additional restrictions beyond airport requirements
China-bound travellers: If flying within China, power banks must display 3C certification from June 28, 2025
Always verify with your specific airline before travel, as requirements can vary by destination and carrier.
