Flying to Korea with Power Banks 2026: Carry-on Wh Limits & Baggage Rules

Calculate watt-hours correctly

Read the printed Wh value first. If only milliamp-hours and voltage appear, calculate Wh = mAh × V ÷ 1,000. A 20,000mAh bank at 3.7V is about 74Wh, not 200Wh. If capacity markings are missing or unreadable, security staff may reject the battery because compliance cannot be verified.

Follow the Korean quantity tiers

Current Korean guidance allows up to five power banks at or below 100Wh in carry-on baggage. More than five in that tier, or batteries above 100Wh and up to 160Wh, require airline approval; quantities in the 100–160Wh range remain limited by dangerous-goods rules. Over 160Wh is not permitted for ordinary passenger carriage.

Protect and store each battery

Never place a power bank in checked baggage. Insulate terminals using an individual pouch, plastic bag, terminal cap or tape. During the flight, keep it on your person or in the seat pocket rather than the overhead bin, and do not charge the power bank. Report heat, swelling, smoke or damage immediately.

Use the compliance calculator

Enter mAh and voltage or the printed Wh, plus quantity. The result applies the Korean baseline but cannot approve carriage. Contact the operating airline for connecting flights, codeshares, medical batteries or unusual equipment, and recheck the return country’s security rules.

Verification checklist

• Use the official source: check the linked provider again shortly before travel because eligibility, prices and operating rules can change.
• Keep a backup: save confirmations and screenshots offline, and carry a second payment, transport or safety option.
• Stop when uncertain: ask the responsible operator instead of repeatedly retrying a payment, booking or security process.