Dreaming of bats can be good and bad depending on what you see as per dream meaning and interpretation. If the dream is gory or scary then you can expect death, accident or murder in life. If it is simply seeing bats then it means you will find hidden treasure or some missing piece in life.
The gory dream of bats is asking you to be careful and to avoid unwanted people, situations and places. The dream also means you might hear or face some new kind of serious diseases.
Dream of bats with blood is sign of serious problems in life like physical fight or health issues.
Dreaming of bats eating or on plants or flying is a good dream and you will see major gains. It means good things from unexpected quarters.