- constant red (battery power <10%)
- switching red-yellow (battery power 10% - 49%) (Switching intensity: colour 1 (flash 1 sec) switch colour 2 (flash 1 sec) - total 2 sec)
- switching yellow-green (battery power 50%-99%) (Switching intensity: colour 1 (flash 1 sec) switch colour 2 (flash 1 sec) - total 2 sec)
- constant green (battery power 100%)