The track has official World Athletics accreditation, making it one of only two venues in London where athletes can set recognised records.
The work was funded by contributions from property developments in the area, rather than council funds.
The upgraded facility is available to residents, schools, sports clubs and athletes of all abilities.
Councillor Ethan Brooks, Cabinet Member for Environment who attended the event said: “Achieving World Athletics certification puts Battersea Park on the map as a venue that can support elite performance while remaining a fantastic community asset for residents, schools and local clubs in this iconic setting.
“It is fantastic to open the upgraded track alongside local young people, some of whom could be the athletes of the future. We hope they, and residents of all ages and abilities, enjoy the benefits of this outstanding facility first-hand.”
