diff --git a/apps/predbat/predbat.py b/apps/predbat/predbat.py
index e1f72ca84..22581d3d5 100644
--- a/apps/predbat/predbat.py
+++ b/apps/predbat/predbat.py
@@ -18,7 +18,7 @@
 import os
 import yaml
 
-THIS_VERSION = "v7.15.5"
+THIS_VERSION = "v7.15.6"
 TIME_FORMAT = "%Y-%m-%dT%H:%M:%S%z"
 TIME_FORMAT_SECONDS = "%Y-%m-%dT%H:%M:%S.%f%z"
 TIME_FORMAT_OCTOPUS = "%Y-%m-%d %H:%M:%S%z"
@@ -1011,7 +1011,7 @@ def find_charge_curve(self):
                     clean_increment=False,
                     smoothing=False,
                     divide_by=1.0,
-                    scale=1.0,
+                    scale=self.base.battery_scaling,
                 )
                 charge_rate = self.base.minute_data(
                     charge_rate_data[0],
@@ -1386,6 +1386,12 @@ def update_status(self, minutes_now, quiet=False):
     def mimic_target_soc(self, current_charge_limit):
         """
         Function to turn on/off charging based on the current SOC and the set charge limit
+
+        Parameters:
+            current_charge_limit (float): The target SOC (State of Charge) limit for charging.
+
+        Returns:
+            None
         """
         if self.soc_percent >= float(current_charge_limit):
             # If current SOC is above Target SOC, turn Grid Charging off
@@ -2221,6 +2227,9 @@ def press_and_poll_button(self, entity_id):
     def rest_readData(self, api="readData"):
         """
         Get inverter status
+
+        :param api: The API endpoint to retrieve data from (default is "readData")
+        :return: The JSON response containing the inverter status, or None if there was an error
         """
         url = self.rest_api + "/" + api
         try:
@@ -3397,24 +3406,35 @@ def dp1(self, value):
         """
         Round to 1 decimal place
         """
-        return round(value * 10) / 10
+        return round(value, 1)
 
     def dp2(self, value):
         """
         Round to 2 decimal places
         """
-        return round(value * 100) / 100
+        return round(value, 2)
 
     def dp3(self, value):
         """
         Round to 3 decimal places
         """
-        return round(value * 1000) / 1000
+        return round(value, 3)
 
     def hit_charge_window(self, charge_window, start, end):
+        """
+        Determines if the given start and end time falls within any of the charge windows.
+
+        Parameters:
+        charge_window (list): A list of dictionaries representing charge windows, each containing "start" and "end" keys.
+        start (int): The start time of the interval to check.
+        end (int): The end time of the interval to check.
+
+        Returns:
+        int: The index of the charge window that the interval falls within, or -1 if it doesn't fall within any charge window.
+        """
         window_n = 0
         for window in charge_window:
-            if end > window["start"] and start <= window["end"]:
+            if end > window["start"] and start < window["end"]:
                 return window_n
             window_n += 1
         return -1
@@ -3422,11 +3442,25 @@ def hit_charge_window(self, charge_window, start, end):
     def in_charge_window(self, charge_window, minute_abs):
         """
         Work out if this minute is within the a charge window
+
+        Parameters:
+        charge_window (list): A sorted list of dictionaries representing charge windows.
+                                Each dictionary should have "start" and "end" keys
+                                representing the start and end minutes of the window.
+
+        minute_abs (int): The absolute minute value to check.
+
+        Returns:
+        int: The index of the charge window if the minute is within a window,
+                otherwise -1.
         """
         window_n = 0
         for window in charge_window:
             if minute_abs >= window["start"] and minute_abs < window["end"]:
                 return window_n
+            elif window["start"] > minute_abs:
+                # As windows are sorted, we can stop searching once we've passed the minute
+                break
             window_n += 1
         return -1
 
@@ -8365,6 +8399,12 @@ def optimise_charge_windows_manual(self):
     def optimise_charge_windows_reset(self, reset_all):
         """
         Reset the charge windows to min
+
+        Parameters:
+        - reset_all (bool): If True, reset all charge windows. If False, reset only the charge windows that are in the record window.
+
+        Returns:
+        None
         """
         if self.charge_window_best and self.calculate_best_charge:
             # Set all to max