Hello!
With the latest Osmo firmware v1.6.2.10 or v1.5.2.0, a fully charged Osmo battery could be extend to around 90 minutes at most. Please refer to the official release note for more details: https://dl.djicdn.com/downloads/ ... Notes_en_160324.pdf
To learn more improvement or accessory for a longer duration of the Osmo battery, please read this thread for more information: http://forum.dji.com/thread-49176-1-1.html
For any question, please feel free to contact us!
Thanks!