For every sport mode, you can choose one of the predefined battery modes: Performance, Endurance, Ultra, Tour. By default, Performance will be activated. You can also create a custom battery mode. When you defined a custom battery mode, this mode will be used by default.
During multisport exercises, the same logic applies:
When you start an exercise using e.g. Endurance mode and then switch to a sport that does not have a custom battery mode configured, Endurance mode remains in use.
When you start an exercise using e.g. Endurance mode and then switch to a sport that does have a custom battery mode configured, the battery mode is switched to custom along with the sport.
When you start an exercise using the custom battery mode and then switch to a sport that does not have a custom battery mode configured, the battery mode is switched to the default mode Performance along with the sport.