answered last question of the analysis

.vscode/settings.json

+{
+    "files.associations": {
+        "bluetooth.h": "c"
+    }
+}
\ No newline at end of file

src/main.c

@@ -62,7 +62,8 @@ int i = 0;
 int j = 0;
 int err;
 int error_type; //if error_type is 1 its a VBUS error if its 2 is a pressure sensor error 
-int battery_level;
+float battery_percent;
+float battery_level;
 int normalized_battery_level;
 float raw_data_array1[DATA_ARRAY]={};
 float max_data_array1[PERIOD_ARRAY]={};
@@ -312,9 +313,7 @@ int bluetooth_init(struct bt_conn_cb *bt_cb, struct bt_remote_srv_cb *remote_cb)
 		LOG_ERR("Could not start advertising (ret = %d)", ret);
 		return ret;
 	}
-
 	return ret;
-
 }
 
 /* Setup Callbacks */
@@ -504,6 +503,14 @@ void button2_callback(const struct device *dev, struct gpio_callback*cb, uint32_
         k_work_submit(&button2_callback_work);
 }
 void button2_callback_work_handler(struct k_work*button2_callback_work){
+        battery_percent = ((100*val_mv)/3600);
+        LOG_INF("Battery_percent: %f",  battery_percent);
+
+        int battery_err = bt_bas_set_battery_level((int)battery_level);
+        if (battery_err) {
+                LOG_ERR("BAS set error (err = %d)", battery_err);
+        }
+
         battery_level =  bt_bas_get_battery_level();
         err = send_data_notification(current_conn, bluetooth_outputs, 3);
          if (err) {