WASHINGTON, April 7 (Reuters) - Southwest Airlines ( LUV )

said Tuesday it will limit passengers to one lithium

portable charger on flights and ban them from being stowed in

overhead bins to reduce risks of inflight battery fires.

The new policy on power banks is effective April 20 and

Southwest ( LUV ) also said portable chargers are no longer allowed to

be re-charged using in-seat power. Last month, the United

Nations aviation agency said the use ​of power banks, or

portable, rechargeable battery ‌packs, would be limited to two

per passenger ​as part of new rules ​for using the devices while

in ⁠the air.