The agency won a pitch to handle the second round of property sales for the developers, a Malaysian consortium of investors operating as the Battersea Power Station Development Company.
News of the project brief comes after it recently emerged that this round would only be marketed in London, with Mission handed responsibility for the publicity drive.
The 254 flats will go on sale in May, and are part of a total 3,500 homes to be built, with some penthouses expected to fetch up to £30m.
This round follows the first phase of flats snapped up at the start of last year, with the first homes of the £8bn development planned for completion by 2016.
In recent reports CEO of Battersea Power Station Development Company Rob Tincknell said: "There has been a lot of comment recently about London’s housing problems and we believe the only way to try to solve this is to build great homes and create a community that people actually want to live in."
Battersea Power Station Development Company confirmed its work with retained corporate agency Brunswick has not been affected.