diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5dccedc
--- /dev/null
+++ b/README.md
@@ -0,0 +1,37 @@
+# Battery heater
+
+## Cegasa battery parameters
+
+### SOC > 95%
+
+Charge Current Limit: 31.4 A
+
+### < 0º C
+
+Charge Current Limit: 0 A
+Discharge Current Limit: 31.4 A
+
+### 0-º C
+
+Charge Current Limit: 31.4 A
+Discharge Current Limit: 31.4 A
+
+### -7º C
+
+Charge Current Limit: 31.4 A
+Discharge Current Limit: 62.8 A
+
+### 8-10º C
+
+Charge Current Limit: 62.8 A
+Discharge Current Limit: 62.8 A
+
+### 11-º C
+
+Charge Current Limit: 62.8 A
+Discharge Current Limit: 94.2 A
+
+### -º C
+
+Charge Current Limit: 94.2 A
+Discharge Current Limit: 94.2 A
diff --git a/batt_11_degree.png b/batt_11_degree.png
new file mode 100644
index 0000000..fa287a6
Binary files /dev/null and b/batt_11_degree.png differ
diff --git a/functions/aemet/package-lock.json b/functions/aemet/package-lock.json
index b1896fc..89faeef 100644
--- a/functions/aemet/package-lock.json
+++ b/functions/aemet/package-lock.json
@@ -8,12 +8,43 @@
       "name": "starter-template",
       "version": "1.0.0",
       "dependencies": {
-        "node-appwrite": "^20.2.1"
+        "fast-xml-parser": "^5.3.3",
+        "node-appwrite": "^20.2.1",
+        "typescript": "^5.4.5"
       },
       "devDependencies": {
+        "@types/node": "^22.19.0",
         "prettier": "^3.2.5"
       }
     },
+    "node_modules/@types/node": {
+      "version": "22.19.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-22.19.7.tgz",
+      "integrity": "sha512-MciR4AKGHWl7xwxkBa6xUGxQJ4VBOmPTF7sL+iGzuahOFaO0jHCsuEfS80pan1ef4gWId1oWOweIhrDEYLuaOw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~6.21.0"
+      }
+    },
+    "node_modules/fast-xml-parser": {
+      "version": "5.3.3",
+      "resolved": "https://registry.npmjs.org/fast-xml-parser/-/fast-xml-parser-5.3.3.tgz",
+      "integrity": "sha512-2O3dkPAAC6JavuMm8+4+pgTk+5hoAs+CjZ+sWcQLkX9+/tHRuTkQh/Oaifr8qDmZ8iEHb771Ea6G8CdwkrgvYA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "strnum": "^2.1.0"
+      },
+      "bin": {
+        "fxparser": "src/cli/cli.js"
+      }
+    },
     "node_modules/node-appwrite": {
       "version": "20.2.1",
       "resolved": "https://registry.npmjs.org/node-appwrite/-/node-appwrite-20.2.1.tgz",
@@ -43,6 +74,38 @@
       "funding": {
         "url": "https://github.com/prettier/prettier?sponsor=1"
       }
+    },
+    "node_modules/strnum": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/strnum/-/strnum-2.1.2.tgz",
+      "integrity": "sha512-l63NF9y/cLROq/yqKXSLtcMeeyOfnSQlfMSlzFt/K73oIaD8DGaQWd7Z34X9GPiKqP5rbSh84Hl4bOlLcjiSrQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/NaturalIntelligence"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "6.21.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
+      "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
+      "dev": true,
+      "license": "MIT"
     }
   }
 }
diff --git a/functions/aemet/package.json b/functions/aemet/package.json
index fb9c115..ebe1879 100644
--- a/functions/aemet/package.json
+++ b/functions/aemet/package.json
@@ -5,12 +5,16 @@
   "main": "src/main.js",
   "type": "module",
   "scripts": {
-    "format": "prettier --write ."
+    "format": "prettier --write .",
+    "build": "tsc"
   },
   "dependencies": {
-    "node-appwrite": "^20.2.1"
+    "fast-xml-parser": "^5.3.3",
+    "node-appwrite": "^20.2.1",
+    "typescript": "^5.4.5"
   },
   "devDependencies": {
+    "@types/node": "^22.19.0",
     "prettier": "^3.2.5"
   }
 }
diff --git a/functions/aemet/src/main.js b/functions/aemet/src/main.js
deleted file mode 100644
index 0539b5e..0000000
--- a/functions/aemet/src/main.js
+++ /dev/null
@@ -1,35 +0,0 @@
-import { Client, Users } from 'node-appwrite';
-
-// This Appwrite function will be executed every time your function is triggered
-export default async ({ req, res, log, error }) => {
-  // You can use the Appwrite SDK to interact with other services
-  // For this example, we're using the Users service
-  const client = new Client()
-    .setEndpoint(process.env.APPWRITE_FUNCTION_API_ENDPOINT)
-    .setProject(process.env.APPWRITE_FUNCTION_PROJECT_ID)
-    .setKey(req.headers['x-appwrite-key'] ?? '');
-  const users = new Users(client);
-
-  try {
-    const response = await users.list();
-    // Log messages and errors to the Appwrite Console
-    // These logs won't be seen by your end users
-    log(`Total users: ${response.total}`);
-  } catch(err) {
-    error("Could not list users: " + err.message);
-  }
-
-  // The req object contains the request data
-  if (req.path === "/ping") {
-    // Use res object to respond with text(), json(), or binary()
-    // Don't forget to return a response!
-    return res.text("Pong");
-  }
-
-  return res.json({
-    motto: "Build like a team of hundreds_",
-    learn: "https://appwrite.io/docs",
-    connect: "https://appwrite.io/discord",
-    getInspired: "https://builtwith.appwrite.io",
-  });
-};
diff --git a/functions/aemet/src/main.ts b/functions/aemet/src/main.ts
new file mode 100644
index 0000000..10a0a54
--- /dev/null
+++ b/functions/aemet/src/main.ts
@@ -0,0 +1,30 @@
+import { Client, Users } from 'node-appwrite';
+import { XMLParser } from 'fast-xml-parser';
+
+// This Appwrite function will be executed every time your function is triggered
+export default async ({ req, res, log, error }: any) => {
+  // You can use the Appwrite SDK to interact with other services
+  // For this example, we're using the Users service
+  const client = new Client()
+    .setEndpoint(process.env.APPWRITE_FUNCTION_API_ENDPOINT ?? '')
+    .setProject(process.env.APPWRITE_FUNCTION_PROJECT_ID ?? '')
+    .setKey(req.headers['x-appwrite-key'] ?? '');
+  const users = new Users(client);
+
+  try {
+    const response = await fetch('https://www.aemet.es/xml/municipios_h/localidad_h_31019.xml');
+
+    if (!response.ok) {
+      throw new Error(`Error! status: ${response.status}`);
+    }
+
+    const parser = new XMLParser();
+    let json = parser.parse(await response.text());
+    log(json)
+    return res.json({sucess: false, data: json})
+
+  } catch(err: any) {
+    error("Error fetching forecast: " + err.message);
+    return res.json({success: false, error: err.message})
+  }
+};
diff --git a/functions/aemet/tsconfig.json b/functions/aemet/tsconfig.json
new file mode 100644
index 0000000..ad43694
--- /dev/null
+++ b/functions/aemet/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "rootDir": "src",
+    "resolveJsonModule": true,
+    "allowJs": true,
+    "outDir": "dist",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitAny": true,
+    "skipLibCheck": true
+  }
+}