I was doing the "strange noise quest". I enter the cave with the eben she wolf and decide to attack. The dislayed stats were:

me: ATK 9, DEF 3, Battle rating 30 . I have a HP of 34 and a CS of 2.4

the eben she wolf: ATK 9, DEF 4, battle rating of 20.

I have lost 3 fights against 4. The 4th allowed me to finally know that the Eben she wolf HP was 46. but I have lost 30 HP in this fight that had lasted 6 turn

Not knowing how many HP has the opponent is really annoying as the battle rating can be misleading.