EnerDel Inc.’s $100 million expansion, one of the biggest in the state this year, earmarks 277 of the 850 new positions for the Indianapolis area.

The lithium-ion battery company announced this morning that it will add 217 jobs to the 100 positions at its headquarters at 8740 Hague Road on the far northeast side of Indianapolis. The new Indianapolis jobs will involve research and cell production.

Sixty more jobs will be located at 15425 Herriman Boulevard in Noblesville, where a renovation is expected to begin soon. The Noblesville location, which has 31,000 square feet, will assemble battery packs.

The rest of the jobs, 478, will be based at a battery manufacturing plant to be located in Indiana. A site has not been secured, EnerDel CEO Ulrik Grape said.

EnerDel will need several hundred thousand square feet of existing space, but would prefer to build the plant, Grape said.

The company also is lining up suppliers, some of which are in Indiana