DETROIT (Reuters) - The board of General Motors Co has approved a plan to produce a plug-in hybrid for the luxury Cadillac brand that will adapt technology developed for the upcoming Chevrolet Volt, according to people briefed on the decision.

The battery-powered Cadillac will be based on the Converj concept GM showed off in January and would become the second extended-range plug-in vehicle in GM's line-up after the Volt, which is set to launch at the end of 2010.

GM's 13-member board approved production of the new Cadillac at a regular meeting last week in Detroit, according to the sources briefed on the action. They asked not to be named since the decision has not been announced.

Production of the Cadillac is not expected before the 2013 model year, two years after the Volt's launch.