By David Shepardson

WASHINGTON (Reuters) -Southwest Airlines said on Friday it will require passengers to take out removable lithium batteries from powered wheelchairs and scooters before boarding, citing fire risks.

The new rules take effect September 25 and Southwest in January will impose new size limits on lithium batteries. On Tuesday, the Federal Aviation Administration issued a safety alert to airlines over risks from lithium batteries in aircraft passenger compartments, citing a large number of serious incidents.

“Lithium batteries have become one of the most common sources of smoke and fire incidents on aircraft. While these events are rare, quick access and visibility are critical to keeping everyone onboard safe,” Southwest said in a note to employees seen by Reuters. “By tak

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