External Battery Extender. Features: The Osmo external battery extender is designed to prolong the operating time of the Osmo by connecting to external power sources such as a dedicated DJI charger or Intelligent Battery. It is ideal for using the Osmo in extended period operations such as timelapse. The Osmo Base is compatible with the External Battery Extender. Compatibility: Osmo /+/Mobile/Pro/RAW.