From April 20, 2026, Southwest limits each passenger to one power bank, with a maximum capacity of 100 Wh.
Visibility still matters
Keep it visible when in use, outside your bag. Do not store it overhead or recharge it from in-seat power. Power banks remain cabin-only.
What to pack
A 20,000 mAh bank at 3.7 V works out to 74 Wh, but its condition, readable rating and any recall restrictions still matter. A second small bank still exceeds the one-device limit.
Generally, a power bank up to 100 Wh can travel in carry-on baggage, subject to the operating airline’s quantity, labelling and route requirements. It must not go in checked baggage. Above 100 Wh, check whether the airline accepts it with approval; above 160 Wh is not allowed in passenger baggage.
How do I convert mAh to watt-hours?
Multiply capacity in mAh by the battery’s nominal voltage, then divide by 1,000. At 3.7 V, a 20,000 mAh power bank is 74 Wh. Use the voltage on your battery label.
Can I put a power bank in my checked bag?
No. Power banks belong in the cabin. If your carry-on is checked at the gate, remove your power banks first.
Is a 100 Wh power bank always allowed?
No blanket guarantee applies. Many airlines allow up to 100 Wh, but quantity, labelling, recall status and local rules also matter. Check your operating airline.
Do the rules change when I connect?
Yes. Every operating airline and departure or transit airport can impose requirements. Check every leg and meet all applicable rules.
Independent guidance, not airline approval. Confirm with your operating airline before travel. Report a correction.
