The lithium-ion batteries used on Boeing Co.

WSJ: Corrections & Amplifications

The Federal Aviation Administration has prohibited commercial, test and delivery flights of U.S.-registered 787s since twin lithium-ion battery incidents on Japan Airlines Co.

WSJ: Air India Flew Boeing 787s After 'Grounding'

That company, Kanto Aircraft Instrument Co. makes a system that monitors voltage, charging and temperature of the lithium-ion batteries.

NPR: US Regulator Asks Boeing For Full Battery History