diff --git a/python/redfish-api/redfish_exporter_v9000.py b/python/redfish-api/redfish_exporter_v9000.py
index c91b5d8..3c954af 100644
--- a/python/redfish-api/redfish_exporter_v9000.py
+++ b/python/redfish-api/redfish_exporter_v9000.py
@@ -19,6 +19,22 @@ from prometheus_client import (
 )
 
 
+@dataclass
+class RedfishResource:
+    """Container for Redfish resource URLs."""
+    chassis: str | None = None
+    systems: str | None = None
+    power: str | None = None
+    session_service: str | None = None
+
+@dataclass
+class PowerMetrics:
+    """Container for power metrics."""
+    voltage: float | None = None
+    watts: float | None = None
+    amps: float | None = None
+    serial: str | None = None
+
 @dataclass
 class RedfishSession:
     """Container for Redfish session data."""
@@ -132,8 +148,8 @@ async def login_hpe(session, host: HostConfig) -> bool:
     try:
         async with session.post(login_url, json=payload, ssl=False, timeout=10) as login_resp:
             if login_resp.status == 201:
-                host.session_token = login_resp.headers.get("X-Auth-Token")
-                host.session_logout = login_resp.headers.get("Location")
+                host.session.token = login_resp.headers.get("X-Auth-Token")
+                host.session.logout_url = login_resp.headers.get("Location")
 
                 if not host.session.token or not host.session.logout_url:
                     raise RuntimeError("Invalid login response")
@@ -228,23 +244,25 @@ async def fetch_with_retry(session, host: HostConfig, url: str) -> dict | None:
     return None
 
 
-async def discover_redfish_resources(session, host: HostConfig) -> dict:
+async def discover_redfish_resources(session, host: HostConfig) -> RedfishResource | None:
     """Discover available Redfish resources and return relevant URLs"""
     root_url = f"https://{host.fqdn}/redfish/v1/"
     data = await fetch_with_retry(session, host, root_url)
     if not data:
         return {}
 
-    # Extrahiere Links aus der Root-Antwort
-    links = {
-        "Chassis": data.get("Chassis", {}).get("@odata.id"),
-        "Systems": data.get("Systems", {}).get("@odata.id"),
-        "SessionService": data.get("SessionService", {}).get("@odata.id"),
-    }
-    if not links["Chassis"]:
+    # Create RedfishRessource object
+    resources = RedfishResource(
+        chassis=data.get("Chassis", {}).get("@odata.id"),
+        systems=data.get("Systems", {}).get("@odata.id"),
+        session_service=data.get("SessionService", {}).get("@odata.id"),
+    )
+
+    if not resources.chassis:
         logging.error("No valid Chassis URL found for host %s", host.fqdn)
-        return {}
-    return links
+        return None
+    
+    return resources
 
 
 def get_power_resource_info(
@@ -313,54 +331,46 @@ def process_power_supplies(
 
 async def process_power_supply(
     session, host: HostConfig, psu_data: dict, power_resource_type: str
-):
+) -> PowerMetrics | None:
     """Extract metrics from PowerSupply"""
     serial = psu_data.get("SerialNumber")
+    metrics = PowerMetrics(serial=serial)
 
     if power_resource_type == "PowerSubsystem":
-        # Newer Redfish API: Metrics are an own "Metrics" ressource
+        # New Redfish API: Metrics are an own "Metrics" ressource
         metrics_url = psu_data.get("Metrics", {}).get("@odata.id")
         if not metrics_url:
             logging.warning("No Metrics found for PowerSupply %s", psu_data.get("Id"))
-            return
+            return None
 
         metrics_url = f"https://{host.fqdn}{metrics_url}"
         metrics_data = await fetch_with_retry(session, host, metrics_url)
         if not metrics_data:
-            return
+            return None
 
         # Get metrics from Metrics ressource
-        line_input_v = metrics_data.get("InputVoltage", {}).get("Reading")
-        watts_input = metrics_data.get("InputPowerWatts", {}).get("Reading")
-        amps_input = metrics_data.get("InputCurrentAmps", {}).get("Reading")
+        metrics.voltage = metrics_data.get("InputVoltage", {}).get("Reading")
+        metrics.watts = metrics_data.get("InputPowerWatts", {}).get("Reading")
+        metrics.amps = metrics_data.get("InputCurrentAmps", {}).get("Reading")
 
     elif power_resource_type == "Power":
         # Older Redfish API: Metrics are direct in PowerSupply as an array
-        line_input_v = psu_data.get("LineInputVoltage")
-        watts_input = psu_data.get("PowerInputWatts")
-        if watts_input is None:
-            watts_input = psu_data.get("LastPowerOutputWatts")
-        amps_input = psu_data.get("InputCurrentAmps")
-        if amps_input is None:
-            if line_input_v and watts_input:
-                amps_input = round(watts_input / line_input_v, 2)
+        metrics.voltage = psu_data.get("LineInputVoltage")
+        metrics.watts = psu_data.get("PowerInputWatts")
+        if metrics.watts is None:
+            metrics.watts = psu_data.get("LastPowerOutputWatts")
+        metrics.amps = psu_data.get("InputCurrentAmps")
+        if metrics.amps is None and metrics.voltage and metrics.watts:
+            metrics.amps = round(metrics.watts / metrics.voltage, 2)
 
     else:
         logging.error(
             "Unknown power resource type for PowerSupply %s", psu_data.get("Id")
         )
-        return
 
-    if amps_input is None and line_input_v and watts_input:
-        amps_input = round(watts_input / line_input_v, 2)
+        return None
 
-    # Update Prometheus metrics
-    if line_input_v is not None:
-        VOLTAGE_GAUGE.labels(host=host.fqdn, psu_serial=serial).set(line_input_v)
-    if watts_input is not None:
-        WATTS_GAUGE.labels(host=host.fqdn, psu_serial=serial).set(watts_input)
-    if amps_input is not None:
-        AMPS_GAUGE.labels(host=host.fqdn, psu_serial=serial).set(amps_input)
+    return metrics
 
 
 def normalize_url(url: str) -> str: