Carry On Bags: Yes
Checked Bags: No
Portable chargers or power banks containing a lithium ion battery must be packed in carry-on bags. Spare lithium batteries, which include both power banks and phone chargers, are prohibited in checked luggage.
The TSA-approved distinction narrows the field to power banks under 100 watt-hours (a 20,000mAh pack is typically around 72Wh, well within limits). But beyond legality, the right pick depends on what you’re charging: a phone, a tablet, a laptop, or all three.
