diff --git a/web/db.py b/web/db.py
index b65eabe..b80fbb9 100644
--- a/web/db.py
+++ b/web/db.py
@@ -126,7 +126,10 @@ class Database:
     def clean_battery(conn):
         # delete charging longer than 17h
         conn.execute("DElETE FROM battery WHERE JULIANDAY(stop_at)-JULIANDAY(start_at)>0.7;")
-        conn.execute("DELETE FROM battery WHERE start_level==end_level;")
+        # delete charging not finished longer than 17h
+        conn.execute("DELETE from battery where stop_at is NULL and JULIANDAY()-JULIANDAY(start_at)>0.7;")
+        #delete little charge
+        conn.execute("DELETE FROM battery WHERE start_level >= end_level-1;")
 
     @staticmethod
     def clean_position(conn):