If you shoot at least once a week, leave the battery inside, if its more than a month. Make sure it stays outside. Yes, it is completely fine to leave your camera's batteries in for an extended period of time. As long as the camera is completely off, then you shouldn't have a problem
Currently, the OLYMPUS PRO Service covers the OM-D E-M1X, OM-D E-M1 Mark II, OM-D E-M1 Mark III,OM-D E-M5 Mark III, OM-D E-M5 Mark II and all M.ZUIKO DIGITAL lenses. For more information on the Olympus PRO Service Programme, please visit this page.
It's important to keep your Olympus product up to date to access new and improved features. Please carefully follow the directions when updating your lens or camera firmware and keep in mind the following: Firmware updates can take several minutes to complete. Do not disconnect the USB cable during the update process. Once you see "OK" on the rear monitor, it is safe to disconnect the cable.
Be sure to have a fully charged battery in the camera and installed Olympus Workspace on your computer. Download OLYMPUS Workspace
Please check that camera, battery and charger contacts are clean, if there is dirt on any of the contacts, the charging process might not work effectively. Please also check if the battery charger or battery is intact by plugging all cables in correctly and ensuring that the charging lamp illuminates. If the problem persists, please contact our Olympus Support Team.