diff --git a/Batterie/module.php b/Batterie/module.php
index f6f157e..0b1c0bb 100644
--- a/Batterie/module.php
+++ b/Batterie/module.php
@@ -133,22 +133,22 @@ class Batterie extends IPSModule implements VerbraucherSchnittstelle
         $this->RegisterTimer(
             'Meldezyklus',
             0,
-            "IPS_RequestAction(\$_IPS['TARGET'], 'Melden', false);"
+            "ENELIX_BatterieTimerAktion(\$_IPS['TARGET'], 'Melden', false);"
         );
         $this->RegisterTimer(
             'RueckmeldungVerzoegert',
             0,
-            "IPS_RequestAction(\$_IPS['TARGET'], 'Melden', true);"
+            "ENELIX_BatterieTimerAktion(\$_IPS['TARGET'], 'Melden', true);"
         );
         $this->RegisterTimer(
             'VorgabeTimeout',
             0,
-            "IPS_RequestAction(\$_IPS['TARGET'], 'VorgabeTimeout', 0);"
+            "ENELIX_BatterieTimerAktion(\$_IPS['TARGET'], 'VorgabeTimeout', false);"
         );
         $this->RegisterTimer(
             'AenderungFreigabe',
             0,
-            "IPS_RequestAction(\$_IPS['TARGET'], 'AenderungFreigabe', 0);"
+            "ENELIX_BatterieTimerAktion(\$_IPS['TARGET'], 'AenderungFreigabe', false);"
         );
     }
 
@@ -220,6 +220,12 @@ class Batterie extends IPSModule implements VerbraucherSchnittstelle
         }
     }
 
+    /** Keep timer execution in the generated module wrapper during module reload. */
+    public function BatterieTimerAktion(string $ident, bool $wert): void
+    {
+        $this->RequestAction($ident, $ident === 'Melden' ? $wert : 0);
+    }
+
     public function RequestAction($ident, $wert): void
     {
         switch ($ident) {
diff --git a/libs/BatterieNetzfahrplanV4RueckmeldungTrait.php b/libs/BatterieNetzfahrplanV4RueckmeldungTrait.php
index eb8484b..b9e5338 100644
--- a/libs/BatterieNetzfahrplanV4RueckmeldungTrait.php
+++ b/libs/BatterieNetzfahrplanV4RueckmeldungTrait.php
@@ -13,7 +13,7 @@ trait BatterieNetzfahrplanV4RueckmeldungTrait
     {
         $this->RegisterPropertyString('NetzfahrplanV4RueckmeldungKonfiguration', '{}');
         $this->RegisterTimer('NetzfahrplanV4RueckmeldungAktualisieren', 0,
-            "IPS_RequestAction(\$_IPS['TARGET'], 'NetzfahrplanV4RueckmeldungAktualisieren', 0);");
+            "ENELIX_BatterieTimerAktion(\$_IPS['TARGET'], 'NetzfahrplanV4RueckmeldungAktualisieren', false);");
     }
 
     private function konfiguriereV4Rueckmeldung(): void
@@ -113,6 +113,12 @@ trait BatterieNetzfahrplanV4RueckmeldungTrait
         }
     }
 
+    /** Strictly cache-only diagnostics; never starts a device read or renews sample times. */
+    public function GetV4BatterieRueckmeldungCache(): string
+    {
+        return json_encode($this->v4BatterieRueckmeldung(), JSON_THROW_ON_ERROR);
+    }
+
     /** Read only. A returned current value is NOT actuator permission. */
     public function GetV4BatterieRueckmeldung(): string
     {
diff --git a/libs/BatterieNetzfahrplanV4TestTrait.php b/libs/BatterieNetzfahrplanV4TestTrait.php
index 20a5c5c..fb9eb13 100644
--- a/libs/BatterieNetzfahrplanV4TestTrait.php
+++ b/libs/BatterieNetzfahrplanV4TestTrait.php
@@ -24,7 +24,7 @@ trait BatterieNetzfahrplanV4TestTrait
         $this->RegisterPropertyString('NetzfahrplanV4GeraeteWatchdogNachweis', '');
         $this->RegisterAttributeString('NetzfahrplanV4TestStatus', '{"status":"disabled"}');
         $this->RegisterTimer('NetzfahrplanV4TestWatchdog', 0,
-            "IPS_RequestAction(\$_IPS['TARGET'], 'NetzfahrplanV4TestWatchdog', 0);");
+            "ENELIX_BatterieTimerAktion(\$_IPS['TARGET'], 'NetzfahrplanV4TestWatchdog', false);");
     }
 
     private function v4BatterieTestSitzung(): array
diff --git a/tests/BatterieTimer/README.md b/tests/BatterieTimer/README.md
new file mode 100644
index 0000000..ccd82ea
--- /dev/null
+++ b/tests/BatterieTimer/README.md
@@ -0,0 +1,83 @@
+# Batterie: Timer-Lebenszyklus
+
+## Korrektur vom 08.10.2026
+
+Alle sechs nativen Batterietimer verwenden den generierten Modulwrapper
+`ENELIX_BatterieTimerAktion` statt eines weiteren `IPS_RequestAction`-Dispatchs.
+Der Wrapper ruft die bestehende Instanzmethode auf und erhaelt Ident, Werttyp,
+Intervalle, Sperren und den bestehenden Melde-/Stellpfad. Keine neuen Timer,
+Properties, Energiezaehler-Resets oder Aenderungen der EV-/SDL-Aufteilung.
+
+`ENELIX_GetV4BatterieRueckmeldungCache` ermoeglicht rein passive Diagnose.
+Die Methode liest nur den bereits bestaetigten Cache mit den unveraenderten
+Frische- und Identitaetspruefungen. Sie startet keine Geraeteabfrage und erneuert
+keinen Zeitstempel. Die bisherige Rueckmelde-API bleibt erhalten.
+
+## Ursache und Beleggrenzen
+
+Im isolierten Symcon-8.0-Kernel liess sich beim Bibliotheksreload waehrend eines
+laufenden `IPS_RequestAction`-Timers eine alte laufende Timergeneration mit
+unstartenden neuen Timern reproduzieren. Das Ende des inneren Callbacks inklusive
+`finally`/Semaphore-Freigabe wurde erreicht, das nachfolgende Ende des aeusseren
+Timerskripts nicht. Damit ist der Fehler auf die native Dispatch-/Reload-Grenze
+eingegrenzt; eine konkrete C++-Kernelursache ist nicht bewiesen. Status 102 ist
+kein Laufnachweis. Das hardwarefreie Gegenbeispiel benoetigt weder Modbus noch
+Manager oder Stellbefehle.
+
+Der Modulwrapper bestand zuerst zwei und am 08.10.2026 weitere sechs native
+Reloads: drei waehrend des Samplers und drei waehrend des Melders. Beide Timer
+liefen anschliessend automatisch weiter, ohne zusaetzliche Timergenerationen.
+Die sechs Wiederholungen liefen 04:34:29 bis 04:35:48 UTC. Bestehende Instanzen
+und Konfigurationshashes blieben unveraendert; die Testbibliothek wurde entfernt.
+Dies ist ein Entwicklungskerneltest, keine Anlagenabnahme.
+
+Ein separates `ApplyChanges` waehrend gehaltener Batteriesperre kann weiterhin
+mit Timeout abbrechen. Bereits laufende Timer liefen im Test weiter. Erfolgreiche
+Initialisierung unter jeder Last oder die Reparatur einer bereits blockierten
+Altgeneration sind durch diesen Patch nicht bewiesen.
+
+## Regressionen
+
+- `php tests/BatterieTimer/lifecycle_checks.php`: 28 isolierte Vertragspruefungen.
+- `composer check`: Syntax und regulaere Suite, einschliesslich isolierter
+  PHPUnit-Einbindung dieser 28 Pruefungen.
+- `native-fixture/` und `reload-six-20261008.py`: exakt getestete, hardwarefreie
+  native Regression. Nicht Bestandteil des normalen Unit-Testlaufs.
+
+Der native Treiber ist bewusst an den geprueften Entwicklungsserver `ubuntu`,
+Symcon 8.0, lokale RPC-Adresse und Modul-Control 34135 gebunden. Vor erneuter
+Ausfuehrung Serverregeln lesen, Testfreigabe einholen und aktuelle Zuordnungen
+pruefen. Die Fixture unter `/srv/agent/battery-timer-native-20261007/fixture`
+bereitstellen; der Treiber validiert deren exakte Hashes, verweigert vorhandene
+Testreste und laedt ausschliesslich seine eigene Testbibliothek neu.
+Nicht auf einer Anlage oder mit veraenderten IDs blind ausfuehren. Die enthaltene
+optionale Destroy-Drain-Diagnose ist kein Produktionsloesungsweg.
+
+## Installation und Rueckfall
+
+Eine laufende alte `IPS_RequestAction`-Generation wird nicht durch eine neue
+Quelldatei repariert. Ein zufaellig beobachtetes Ruhefenster garantiert keinen
+racesicheren Erstwechsel. Vor Anlageninstallation Quellen, aktuelle Instanz-
+konfigurationen und Bedieneinstellungen sichern; parallele Aenderungen erhalten.
+Fuer den ersten Wechsel ist ein separat freigegebener kontrollierter Stop/Start
+mit Installation waehrend des Stillstands der robuste Weg. Keine externen Ticks,
+Create-Umgehungen, wiederholten Blind-Reloads oder gelockerten Frischepruefungen.
+
+Danach automatische LastRun-Fortschritte des 5-s-Melders und 1-s-Samplers,
+Originalzeitstempel frischer bestaetigter Cachewerte und fehlende alte doppelte
+Timer pruefen. Manager und Ladepunkte mitbeobachten. Keine V4-Aktivierung oder
+Stellversuche ableiten. Der zuletzt dokumentierte Anlagenreload vom 08.10.2026
+04:47 UTC blockierte erneut Batterietimer und liess Easee getrennt; dieser
+historische Befund muss vor Eingriffen erneut live geprueft werden.
+
+Rueckfall nur auf gesicherte betroffene Quelldateien, nicht pauschal auf alte
+Konfigurationen oder Energiezustaende. Ein Quellrollback allein beseitigt keinen
+bereits blockierten Kernelzustand. Veroeffentlichung, Installation und tatsaechlich
+gemessener Kernelbetrieb sind getrennte Nachweise.
+
+## Pull-Request-Kurztext
+
+Timerdispatch fuer Batterie auf den generierten Modulwrapper umgestellt;
+bestehende Aktionsvertraege und Schutzpruefungen unveraendert. Rein passive
+Cache-Diagnose hinzugefuegt. Offline-Regressionen und isolierte native
+Reload-Reproduktion dokumentieren Ursache, Korrektur und Migrationsgrenzen.
diff --git a/tests/BatterieTimer/lifecycle_checks.php b/tests/BatterieTimer/lifecycle_checks.php
new file mode 100644
index 0000000..890eeb2
--- /dev/null
+++ b/tests/BatterieTimer/lifecycle_checks.php
@@ -0,0 +1,124 @@
+<?php
+declare(strict_types=1);
+
+// Offline contract tests only. Native scheduling is verified by the separate kernel fixture.
+if (PHP_SAPI !== 'cli' || function_exists('IPS_GetKernelVersion')) {
+    throw new RuntimeException('Standalone PHP CLI only; never load mocks into Symcon.');
+}
+
+$GLOBALS['deviceCalls'] = 0;
+$GLOBALS['testParent'] = 20;
+function MBUS_UpdateValues(int $id): bool { ++$GLOBALS['deviceCalls']; throw new RuntimeException('Unexpected device I/O'); }
+function ModBus_RequestRead(int $id): bool { ++$GLOBALS['deviceCalls']; throw new RuntimeException('Unexpected device I/O'); }
+function IPS_VariableExists(int $id): bool { return $id === 10; }
+function IPS_GetObject(int $id): array { return ['ParentID' => $GLOBALS['testParent'], 'ObjectIdent' => 'grid']; }
+function IPS_GetInstanceListByModuleID(string $id): array { return [17004]; }
+function IPS_GetProperty(int $id, string $key): mixed
+{
+    return $key === 'AutomatischeSuche' ? false : '[{"Aktiv":true,"InstanzID":44234}]';
+}
+
+class IPSModule
+{
+    public int $InstanceID = 44234;
+    public array $properties = [], $attributes = [], $buffers = [], $timers = [], $calls = [];
+    public function Create(): void {}
+    public function __call(string $method, array $args): mixed
+    {
+        if (str_starts_with($method, 'RegisterProperty')) { $this->properties[$args[0]] ??= $args[1]; return null; }
+        if (str_starts_with($method, 'RegisterAttribute')) { $this->attributes[$args[0]] ??= $args[1]; return null; }
+        if (str_starts_with($method, 'RegisterVariable') || $method === 'EnableAction') return null;
+        if (str_starts_with($method, 'ReadProperty')) return $this->properties[$args[0]];
+        if (str_starts_with($method, 'ReadAttribute')) return $this->attributes[$args[0]];
+        if ($method === 'RegisterTimer') { $this->timers[$args[0]] = ['interval' => $args[1], 'script' => $args[2]]; return null; }
+        if ($method === 'GetBuffer') return $this->buffers[$args[0]] ?? '';
+        throw new RuntimeException('Unexpected mock call: ' . $method);
+    }
+}
+
+require __DIR__ . '/../../Batterie/module.php';
+class TimerContractBattery extends Batterie
+{
+    public function RequestAction($ident, $value): void { $this->calls[] = [$ident, $value]; }
+}
+
+$battery = new TimerContractBattery();
+$battery->Create();
+$GLOBALS['testBattery'] = $battery;
+function ENELIX_BatterieTimerAktion(int $id, string $ident, bool $value): void
+{
+    if ($id !== 44234) throw new RuntimeException('Wrong timer target');
+    $GLOBALS['testBattery']->BatterieTimerAktion($ident, $value);
+}
+
+$count = 0;
+function check(bool $valid, string $name): void
+{
+    global $count;
+    if (!$valid) throw new RuntimeException('FAIL ' . $name);
+    ++$count;
+    echo 'PASS ' . $name . PHP_EOL;
+}
+function rejects(callable $call, string $reason): void
+{
+    try { $call(); }
+    catch (RuntimeException $error) {
+        check($error->getMessage() === $reason, $reason);
+        return;
+    }
+    throw new RuntimeException('Expected rejection: ' . $reason);
+}
+
+$expected = [
+    'Meldezyklus' => ['Melden', false],
+    'RueckmeldungVerzoegert' => ['Melden', true],
+    'VorgabeTimeout' => ['VorgabeTimeout', 0],
+    'AenderungFreigabe' => ['AenderungFreigabe', 0],
+    'NetzfahrplanV4RueckmeldungAktualisieren' => ['NetzfahrplanV4RueckmeldungAktualisieren', 0],
+    'NetzfahrplanV4TestWatchdog' => ['NetzfahrplanV4TestWatchdog', 0],
+];
+check(count($battery->timers) === count($expected), 'same six native timers');
+$battery->attributes['ZustandBezogeneEnergie'] = 123.456;
+$battery->attributes['EnergieStandZeit'] = 123456789;
+$before = [$battery->properties, $battery->attributes, $battery->buffers];
+foreach ($expected as $name => $call) {
+    $timer = $battery->timers[$name];
+    check($timer['interval'] === 0, $name . ' keeps Create interval zero');
+    check(str_starts_with($timer['script'], 'ENELIX_BatterieTimerAktion(')
+        && !str_contains($timer['script'], 'IPS_RequestAction('), $name . ' uses generated wrapper');
+    $_IPS = ['TARGET' => 44234];
+    eval($timer['script']);
+    check(end($battery->calls) === $call, $name . ' preserves action and value types');
+}
+check([$battery->properties, $battery->attributes, $battery->buffers] === $before,
+    'timer entrypoint does not change configuration, energy or buffers');
+
+$config = ['batteryInstanceId' => 44234, 'managerId' => 17004,
+    'sources' => [['variableId' => 10, 'parentId' => 20, 'ident' => 'grid']]];
+$json = json_encode($config, JSON_THROW_ON_ERROR);
+$battery->properties['NetzfahrplanV4RueckmeldungKonfiguration'] = $json;
+$sample = ['kind' => 'local_physical_feedback', 'checkedAt' => time(),
+    'sourceOldestAt' => time() - 1, 'deviceReadConfirmed' => true, 'batteryW' => -123.0];
+$validBuffers = ['V4ConfirmedFeedback' => json_encode($sample, JSON_THROW_ON_ERROR),
+    'V4ConfirmedFeedbackConfig' => hash('sha256', $json),
+    'V4ConfirmedFeedbackMono' => (string) (hrtime(true) / 1e9)];
+$battery->buffers = $validBuffers;
+check($battery->GetV4BatterieRueckmeldungCache() === $validBuffers['V4ConfirmedFeedback'],
+    'cache-only API returns original confirmed sample and timestamps');
+check($battery->buffers === $validBuffers, 'cache inspection never renews buffers');
+foreach ([time() - 3, time() + 10] as $invalidTime) {
+    $battery->buffers = $validBuffers;
+    $battery->buffers['V4ConfirmedFeedback'] = json_encode(array_replace($sample, ['checkedAt' => $invalidTime]));
+    rejects(fn() => $battery->GetV4BatterieRueckmeldungCache(), 'feedback_confirmed_cache_stale_or_invalid');
+}
+$battery->buffers = $validBuffers;
+$battery->buffers['V4ConfirmedFeedbackMono'] = (string) (hrtime(true) / 1e9 - 3);
+rejects(fn() => $battery->GetV4BatterieRueckmeldungCache(), 'feedback_confirmed_cache_stale_or_invalid');
+$battery->buffers = $validBuffers;
+$battery->buffers['V4ConfirmedFeedbackConfig'] = 'changed';
+rejects(fn() => $battery->GetV4BatterieRueckmeldungCache(), 'feedback_confirmed_cache_stale_or_invalid');
+$battery->buffers = $validBuffers;
+$GLOBALS['testParent'] = 99;
+rejects(fn() => $battery->GetV4BatterieRueckmeldungCache(), 'feedback_cache_source_changed');
+check($GLOBALS['deviceCalls'] === 0, 'all cache checks perform zero device reads');
+echo "TOTAL $count offline battery timer/cache contract checks passed. Native scheduler not mocked as proof.\n";
diff --git a/tests/BatterieTimer/native-fixture/TimerLifecycleProbe/module.json b/tests/BatterieTimer/native-fixture/TimerLifecycleProbe/module.json
new file mode 100644
index 0000000..1dcdbc5
--- /dev/null
+++ b/tests/BatterieTimer/native-fixture/TimerLifecycleProbe/module.json
@@ -0,0 +1,11 @@
+{
+  "id": "{044221CE-A8E5-4413-A081-C3235FF73350}",
+  "name": "TimerLifecycleProbe",
+  "type": 3,
+  "vendor": "ENELIX Test",
+  "aliases": [],
+  "parentRequirements": [],
+  "childRequirements": [],
+  "implemented": [],
+  "prefix": "ENLTMR"
+}
diff --git a/tests/BatterieTimer/native-fixture/TimerLifecycleProbe/module.php b/tests/BatterieTimer/native-fixture/TimerLifecycleProbe/module.php
new file mode 100644
index 0000000..3d96d7d
--- /dev/null
+++ b/tests/BatterieTimer/native-fixture/TimerLifecycleProbe/module.php
@@ -0,0 +1,90 @@
+<?php
+declare(strict_types=1);
+
+// Development-only native timer fixture. No device, manager or variable actions.
+class TimerLifecycleProbe extends IPSModule
+{
+    public function Create(): void
+    {
+        parent::Create();
+        $this->RegisterPropertyInteger('ReadWorkMs', 1500);
+        $this->RegisterPropertyInteger('ReportWorkMs', 1500);
+        $this->RegisterPropertyString('LifecycleMode', 'baseline');
+        $this->RegisterAttributeInteger('ReadRuns', 0);
+        $this->RegisterAttributeInteger('ReportRuns', 0);
+        $this->RegisterAttributeInteger('CallbackEnds', 0);
+        $this->RegisterAttributeInteger('ScriptEnds', 0);
+        $this->RegisterTimer('Meldezyklus', 0, "IPS_RequestAction(\$_IPS['TARGET'], 'Report', 0); ENLTMR_MarkScriptEnd(\$_IPS['TARGET']);");
+        $this->RegisterTimer('Rueckmeldesampler', 0, "IPS_RequestAction(\$_IPS['TARGET'], 'Read', 0); ENLTMR_MarkScriptEnd(\$_IPS['TARGET']);");
+    }
+
+    public function ApplyChanges(): void
+    {
+        parent::ApplyChanges();
+        $lock = 'ENELIX.TimerProbe.Battery.' . $this->InstanceID;
+        if (!IPS_SemaphoreEnter($lock, 1000)) throw new RuntimeException('Probe battery busy');
+        IPS_SemaphoreLeave($lock);
+        $this->SetTimerInterval('Meldezyklus', 5000);
+        $this->SetTimerInterval('Rueckmeldesampler', 1000);
+        $this->SetStatus(102);
+    }
+
+    public function Destroy(): void
+    {
+        IPS_LogMessage('ENELIXTimerLifecycleProbe', 'Destroy entry ' . $this->InstanceID);
+        // Isolated experiment only: determine whether unload can drain native timers.
+        if (IPS_InstanceExists($this->InstanceID) && $this->ReadPropertyString('LifecycleMode') === 'drain') {
+            $this->SetTimerInterval('Meldezyklus', 0);
+            $this->SetTimerInterval('Rueckmeldesampler', 0);
+            $deadline = microtime(true) + 2.5;
+            do {
+                $running = false;
+                foreach (IPS_GetTimerList() as $id) {
+                    $timer = IPS_GetTimer($id);
+                    if ($timer['InstanceID'] === $this->InstanceID && $timer['Running']) $running = true;
+                }
+                if ($running) usleep(20000);
+            } while ($running && microtime(true) < $deadline);
+            IPS_LogMessage('ENELIXTimerLifecycleProbe', 'Destroy drain running=' . (int) $running);
+        }
+        parent::Destroy();
+    }
+
+    public function Tick(string $ident): void
+    {
+        $this->RequestAction($ident, 0);
+    }
+
+    public function StopProbe(): void
+    {
+        $this->SetTimerInterval('Meldezyklus', 0);
+        $this->SetTimerInterval('Rueckmeldesampler', 0);
+    }
+
+    public function RequestAction($Ident, $Value): void
+    {
+        if (!in_array($Ident, ['Read', 'Report'], true)) throw new InvalidArgumentException('Unknown probe action');
+        $lock = 'ENELIX.TimerProbe.' . ($Ident === 'Read' ? 'Feedback.' : 'Battery.') . $this->InstanceID;
+        if (!IPS_SemaphoreEnter($lock, 0)) return;
+        try {
+            usleep(max(0, min(2000, $this->ReadPropertyInteger($Ident . 'WorkMs'))) * 1000);
+            $this->WriteAttributeInteger($Ident . 'Runs', $this->ReadAttributeInteger($Ident . 'Runs') + 1);
+        } finally {
+            IPS_SemaphoreLeave($lock);
+        }
+        $this->WriteAttributeInteger('CallbackEnds', $this->ReadAttributeInteger('CallbackEnds') + 1);
+    }
+
+    public function MarkScriptEnd(): void
+    {
+        $this->WriteAttributeInteger('ScriptEnds', $this->ReadAttributeInteger('ScriptEnds') + 1);
+    }
+
+    public function ReadProbeState(): string
+    {
+        return json_encode(['readRuns' => $this->ReadAttributeInteger('ReadRuns'),
+            'callbackEnds' => $this->ReadAttributeInteger('CallbackEnds'),
+            'scriptEnds' => $this->ReadAttributeInteger('ScriptEnds'),
+            'reportRuns' => $this->ReadAttributeInteger('ReportRuns')], JSON_THROW_ON_ERROR);
+    }
+}
diff --git a/tests/BatterieTimer/native-fixture/library.json b/tests/BatterieTimer/native-fixture/library.json
new file mode 100644
index 0000000..cb0c8c6
--- /dev/null
+++ b/tests/BatterieTimer/native-fixture/library.json
@@ -0,0 +1,10 @@
+{
+  "id": "{748CA183-27CD-4EC2-8730-A8A0A2B2C953}",
+  "author": "ENELIX Test",
+  "name": "ENELIX Timer Lifecycle Probe",
+  "url": "",
+  "compatibility": {"version": "8.0"},
+  "version": "1.0",
+  "build": 1,
+  "date": 1791397591
+}
diff --git a/tests/BatterieTimer/reload-six-20261008.py b/tests/BatterieTimer/reload-six-20261008.py
new file mode 100644
index 0000000..e3365eb
--- /dev/null
+++ b/tests/BatterieTimer/reload-six-20261008.py
@@ -0,0 +1,171 @@
+"""Bounded native fixture test on ubuntu only; never reload Enelix-EMS."""
+import hashlib
+import json
+from pathlib import Path
+import shutil
+import socket
+import sys
+import time
+import urllib.request
+
+if socket.gethostname() != 'ubuntu':
+    raise RuntimeError('Development host only')
+base = Path('/srv/agent/battery-timer-native-20261007')
+folder = 'ENELIXTimerLifecycleProbe20261007'
+target = Path('/srv/symcon/v8/dev/data/modules') / folder
+module = '{044221CE-A8E5-4413-A081-C3235FF73350}'
+library = '{748CA183-27CD-4EC2-8730-A8A0A2B2C953}'
+mc = 34135
+report = {'hardwareCommands':0,'reloadedLibrary':folder,'phases':[],
+          'scope':'Six explicitly authorized isolated reload tests, 2026-10-08',
+          'registrationReloads':0, 'testReloads':0, 'startedAt':time.time()}
+mode = 'wrapper'
+report['mode'] = mode
+cycles = 3
+report['cycles'] = cycles
+report_path = base / ('report-six-reloads-20261008-' + str(int(time.time())) + '.json')
+instance = None
+
+def rpc(method, params, timeout=20):
+    payload=json.dumps({'jsonrpc':'2.0','id':1,'method':method,'params':params}).encode()
+    req=urllib.request.Request('http://127.0.0.1:3777/api/',payload,{'Content-Type':'application/json'})
+    with urllib.request.urlopen(req,timeout=timeout) as r:
+        result=json.load(r)
+    if 'error' in result: raise RuntimeError(str(result['error']))
+    return result['result']
+
+def snapshot():
+    ts=[]
+    for tid in rpc('IPS_GetTimerList',[]):
+        t=rpc('IPS_GetTimer',[tid])
+        if t.get('InstanceID')==instance: ts.append(t)
+    return {'at':time.time(),'timers':ts,'state':json.loads(rpc('ENLTMR_ReadProbeState',[instance]))}
+
+def wait_running(name):
+    end=time.monotonic()+18
+    while time.monotonic()<end:
+        snap=snapshot()
+        if any(t['Name']==name and t['Running'] for t in snap['timers']): return snap
+        time.sleep(.15)
+    raise RuntimeError('No running timer: '+name)
+
+report['kernel']=rpc('IPS_GetKernelVersion',[])
+if report['kernel']!='8.0': raise RuntimeError('Symcon 8.0 required')
+report['kernelDate']=rpc('IPS_GetKernelDate',[])
+if rpc('IPS_GetInstance',[mc])['ModuleInfo']['ModuleID'] != '{B8A5067A-AFC2-3798-FEDC-BCD02A45615E}':
+    raise RuntimeError('Module Control identity changed')
+if rpc('IPS_ModuleExists',[module]) or target.exists(): raise RuntimeError('Existing fixture; refusing overwrite')
+report['beforeInstances']=rpc('IPS_GetInstanceList',[])
+report['beforeConfigurationHashes']={str(i):hashlib.sha256(rpc('IPS_GetConfiguration',[i]).encode()).hexdigest()
+                                    for i in report['beforeInstances']}
+report['beforeTimers']=[rpc('IPS_GetTimer',[i]) for i in rpc('IPS_GetTimerList',[])]
+report['preexistingProbeTimers'] = [t for t in report['beforeTimers'] if t['InstanceID'] in [32751,34162,50935]]
+if report['preexistingProbeTimers']: raise RuntimeError('Uncleared previous fixture timers')
+if len(report['beforeTimers']) > 55:
+    raise RuntimeError('Timer growth exceeds bounded test budget')
+expected_fixture = {
+    'library.json':'d856277670e083d8a2616ad5f9994f6cb109fd887c47be2e5d152316eddb4067',
+    'TimerLifecycleProbe/module.json':'17a886572a8164a909ecfc3075cada9af2d510d06fbba012ff597c247b732161',
+    'TimerLifecycleProbe/module.php':'c9b4dfc861ad29917052e2fdef44b13e90f219f954b14e3d952de7de0f232742',
+}
+found_fixture = {str(p.relative_to(base/'fixture')):hashlib.sha256(p.read_bytes()).hexdigest()
+                 for p in (base/'fixture').rglob('*') if p.is_file()}
+if found_fixture != expected_fixture: raise RuntimeError('Unreviewed fixture changes; aborting')
+report['originalFixtureHashes'] = found_fixture
+shutil.copytree(base/'fixture',target)
+if mode == 'wrapper':
+    file = target/'TimerLifecycleProbe/module.php'
+    source = file.read_text().replace("IPS_RequestAction(\\$_IPS['TARGET'], 'Report', 0);", "ENLTMR_Tick(\\$_IPS['TARGET'], 'Report');")
+    source = source.replace("IPS_RequestAction(\\$_IPS['TARGET'], 'Read', 0);", "ENLTMR_Tick(\\$_IPS['TARGET'], 'Read');")
+    file.write_text(source)
+report['fixtureSourceSha256'] = hashlib.sha256((target/'TimerLifecycleProbe/module.php').read_bytes()).hexdigest()
+try:
+    rpc('MC_ReloadModule',[mc,folder])
+    report['registrationReloads'] += 1
+    if not rpc('IPS_ModuleExists',[module]): raise RuntimeError('Fixture registration failed')
+    instance=rpc('IPS_CreateInstance',[module])
+    report['instance']=instance
+    rpc('IPS_SetName',[instance,'Temporary ENELIX timer lifecycle probe'])
+    rpc('IPS_SetProperty',[instance,'LifecycleMode',mode])
+    rpc('IPS_ApplyChanges',[instance])
+    phases = [('reload','Rueckmeldesampler'),('reload','Meldezyklus')] * cycles
+    for action, timer in phases:
+        before = wait_running(timer)
+        if mode == 'idle':
+            end = time.monotonic() + 15
+            while any(t['Running'] for t in before['timers']):
+                if time.monotonic() > end: raise RuntimeError('No idle window')
+                time.sleep(.05)
+                before = snapshot()
+        phase={'action':action,'during':timer,'before':before}
+        start=time.monotonic()
+        try:
+            report['testReloads'] += 1
+            phase['result']=rpc('MC_ReloadModule',[mc,folder])
+        except RuntimeError as e:
+            phase['error']=str(e)
+        phase['durationSeconds']=time.monotonic()-start
+        phase['after']=[]
+        for _ in range(5):
+            time.sleep(2)
+            phase['after'].append(snapshot())
+        report['phases'].append(phase)
+        report_path.write_text(json.dumps(report,indent=2))
+        print(json.dumps({'phase':action,'during':timer,'duration':phase['durationSeconds'],
+                          'error':phase.get('error'),'first':phase['after'][0]['state'],
+                          'last':phase['after'][-1]['state'], 'timers':phase['after'][-1]['timers']}),flush=True)
+        states=phase['after']
+        if states[-1]['state']==states[0]['state']:
+            report['stalled']=True
+            break
+except Exception as e:
+    report['error']=type(e).__name__+': '+str(e)
+    raise
+finally:
+    if instance is not None:
+        if rpc('IPS_GetInstance',[instance])['ModuleInfo']['ModuleID']!=module:
+            raise RuntimeError('Fixture identity changed; refusing cleanup')
+        rpc('ENLTMR_StopProbe',[instance])
+        deadline = time.monotonic() + 3
+        while time.monotonic() < deadline:
+            if not any(t['Running'] for t in snapshot()['timers']): break
+            time.sleep(.1)
+        rpc('IPS_DeleteInstance',[instance])
+    try:
+        rpc('MC_DeleteModule',[mc,folder])
+    except Exception as e:
+        report['cleanupError']=str(e)
+    report['remainingFixtureInstances']=rpc('IPS_GetInstanceListByModuleID',[module]) if rpc('IPS_ModuleExists',[module]) else []
+    report['afterInstances']=rpc('IPS_GetInstanceList',[])
+    report['afterConfigurationHashes']={str(i):hashlib.sha256(rpc('IPS_GetConfiguration',[i]).encode()).hexdigest()
+                                       for i in report['afterInstances']}
+    report['originalConfigurationsPreserved'] = report['beforeConfigurationHashes'] == report['afterConfigurationHashes']
+    report['afterTimers']=[rpc('IPS_GetTimer',[i]) for i in rpc('IPS_GetTimerList',[])]
+    report['orphanFixtureTimers']=[t for t in report['afterTimers'] if t['InstanceID'] == instance]
+    report['originalInstancesPreserved']=set(report['beforeInstances'])==set(report['afterInstances'])
+    report['finishedAt'] = time.time()
+    report_path.write_text(json.dumps(report,indent=2))
+    print(json.dumps({'finished':True,'instance':instance,'cleanupError':report.get('cleanupError'),
+                      'originalInstancesPreserved':report['originalInstancesPreserved'],
+                      'orphanFixtureTimers':report['orphanFixtureTimers'],'report':str(report_path)}),flush=True)
+
+if mode == 'wrapper':
+    recovered = len(report['phases']) == 2 * cycles and report['testReloads'] == 6
+    for phase in report['phases']:
+        first, last = phase['after'][0], phase['after'][-1]
+        recovered = recovered and all(last['state'][key] > first['state'][key]
+                                      for key in ['readRuns', 'reportRuns', 'scriptEnds'])
+        recovered = recovered and len(last['timers']) == 2 and all(t['LastRun'] > 0 for t in last['timers'])
+        if phase['action'] == 'reload':
+            recovered = recovered and 'error' not in phase
+    recovered = (recovered and report['originalInstancesPreserved'] and report['originalConfigurationsPreserved']
+                 and not report['orphanFixtureTimers'] and not report.get('cleanupError'))
+    report['nativeTimerRecoveryPassed'] = bool(recovered)
+    report['applyBusyErrors'] = [p['error'] for p in report['phases'] if p['action'] == 'apply' and 'error' in p]
+    report_path.write_text(json.dumps(report, indent=2))
+    print(json.dumps({'nativeTimerRecoveryPassed':report['nativeTimerRecoveryPassed'],
+                      'testReloads':report['testReloads'],
+                      'originalConfigurationsPreserved':report['originalConfigurationsPreserved'],
+                      'report':str(report_path)}),flush=True)
+    # Busy ApplyChanges is reported separately, never counted as a successful initialization.
+    raise SystemExit(0 if recovered else 1)
diff --git a/tests/BatterieTimerLifecycleTest.php b/tests/BatterieTimerLifecycleTest.php
new file mode 100644
index 0000000..39efbd1
--- /dev/null
+++ b/tests/BatterieTimerLifecycleTest.php
@@ -0,0 +1,28 @@
+<?php
+declare(strict_types=1);
+
+namespace Belevo\EnelixEMS\Tests;
+
+use PHPUnit\Framework\TestCase;
+
+final class BatterieTimerLifecycleTest extends TestCase
+{
+    /**
+     * @runInSeparateProcess
+     * @preserveGlobalState disabled
+     */
+    public function testTimerWrapperUndStriktPassiverRueckmeldecache(): void
+    {
+        global $count;
+        ob_start();
+        try {
+            require __DIR__ . '/BatterieTimer/lifecycle_checks.php';
+            $output = (string) ob_get_contents();
+        } finally {
+            ob_end_clean();
+        }
+        self::assertSame(28, $count);
+        self::assertSame(0, $GLOBALS['deviceCalls']);
+        self::assertStringContainsString('TOTAL 28 offline battery timer/cache contract checks passed.', $output);
+    }
+}