diff --git a/meshview/templates/node_graphs.html b/meshview/templates/node_graphs.html
index f6cfd8e..a068ea2 100644
--- a/meshview/templates/node_graphs.html
+++ b/meshview/templates/node_graphs.html
@@ -1,15 +1,14 @@
-<!-- Macro -->
 {% macro graph(name) %}
 <div id="{{name}}Chart" style="width: 100%; height: 100%;"></div>
 {% endmacro %}
 
-<!-- Buttons for Download CSV and Expand Modal -->
+<!-- Download and Expand buttons -->
 <div class="d-flex justify-content-end mb-2">
   <button class="btn btn-sm btn-outline-light me-2" id="downloadCsvBtn">Download CSV</button>
   <button class="btn btn-sm btn-outline-light" data-bs-toggle="modal" data-bs-target="#fullChartModal">Expand</button>
 </div>
 
-<!-- Tabs -->
+<!-- Tab Navigation -->
 <ul class="nav nav-tabs" role="tablist">
   {% for name in [
       "power", "utilization", "temperature", "humidity", "pressure",
@@ -21,7 +20,7 @@
   {% endfor %}
 </ul>
 
-<!-- Tab content -->
+<!-- Tab Content -->
 <div class="tab-content mt-3" style="height: 40vh;">
   {% for name in [
       "power", "utilization", "temperature", "humidity", "pressure",
@@ -33,7 +32,7 @@
   {% endfor %}
 </div>
 
-<!-- Fullscreen Modal for graphs -->
+<!-- Fullscreen Modal -->
 <div class="modal fade" id="fullChartModal" tabindex="-1" aria-labelledby="fullChartModalLabel" aria-hidden="true">
   <div class="modal-dialog modal-fullscreen">
     <div class="modal-content bg-dark text-white">
@@ -68,11 +67,10 @@ document.addEventListener("DOMContentLoaded", function () {
       if (!resp.ok) throw new Error(`Failed to load data for ${name}`);
       const data = await resp.json();
 
-      // Reverse to go left-to-right
+      // Reverse for chronological order
       data.timestamps.reverse();
       data.series.forEach(s => s.data.reverse());
 
-      // Format timestamps as MM-DD-YY
       const formattedDates = data.timestamps.map(t => {
         const d = new Date(t);
         return `${(d.getMonth() + 1).toString().padStart(2, '0')}-${d.getDate().toString().padStart(2, '0')}-${d.getFullYear().toString().slice(-2)}`;
@@ -84,14 +82,45 @@ document.addEventListener("DOMContentLoaded", function () {
       };
 
       const chart = echarts.init(chartDiv);
+
+      const isDualAxis = name === 'power';
+
       chart.setOption({
-        tooltip: { trigger: 'axis' },
+        tooltip: {
+          trigger: 'axis',
+          formatter: function (params) {
+            return params.map(p => {
+              const label = p.seriesName.toLowerCase();
+              const unit = label.includes('volt') ? 'V' : label.includes('battery') ? '%' : '';
+              return `${p.marker} ${p.seriesName}: ${p.data}${unit}`;
+            }).join('<br>');
+          }
+        },
         xAxis: {
           type: 'category',
           data: formattedDates,
           axisLabel: { color: '#fff', rotate: 45 },
         },
-        yAxis: {
+        yAxis: isDualAxis ? [
+          {
+            type: 'value',
+            name: 'Battery (%)',
+            min: 0,
+            max: 120,
+            position: 'left',
+            axisLabel: { color: '#fff' },
+            nameTextStyle: { color: '#fff' }
+          },
+          {
+            type: 'value',
+            name: 'Voltage (V)',
+            min: 0,
+            max: 6,
+            position: 'right',
+            axisLabel: { color: '#fff' },
+            nameTextStyle: { color: '#fff' }
+          }
+        ] : {
           type: 'value',
           axisLabel: { color: '#fff' },
         },
@@ -102,6 +131,7 @@ document.addEventListener("DOMContentLoaded", function () {
           smooth: true,
           connectNulls: true,
           showSymbol: false,
+          yAxisIndex: isDualAxis && s.name.toLowerCase().includes('volt') ? 1 : 0,
         })),
         legend: { textStyle: { color: '#fff' } }
       });
@@ -111,11 +141,12 @@ document.addEventListener("DOMContentLoaded", function () {
       console.error(err);
       currentChartData = null;
       currentChartName = null;
+      chartDiv.innerHTML = `<div class="text-white text-center mt-5">Error loading ${name} data.</div>`;
       return null;
     }
   }
 
-  // Load the first chart
+  // Load first chart
   const firstTabBtn = document.querySelector('.nav-tabs button.nav-link.active');
   if (firstTabBtn) {
     const name = firstTabBtn.textContent.toLowerCase();
@@ -123,7 +154,7 @@ document.addEventListener("DOMContentLoaded", function () {
     loadChart(name, chartId).then(chart => currentChart = chart);
   }
 
-  // Tab change event
+  // On tab switch
   document.querySelectorAll('.nav-tabs button.nav-link').forEach(button => {
     button.addEventListener('shown.bs.tab', event => {
       const name = event.target.textContent.toLowerCase();
@@ -132,7 +163,7 @@ document.addEventListener("DOMContentLoaded", function () {
     });
   });
 
-  // Download CSV button
+  // CSV Download
   document.getElementById('downloadCsvBtn').addEventListener('click', () => {
     if (!currentChartData || !currentChartName) {
       alert("Chart data not loaded yet.");
@@ -159,7 +190,7 @@ document.addEventListener("DOMContentLoaded", function () {
     URL.revokeObjectURL(url);
   });
 
-  // Expand chart modal
+  // Fullscreen modal chart
   document.getElementById('fullChartModal').addEventListener('shown.bs.modal', () => {
     if (!currentChartData || !currentChartName) return;
 
@@ -167,15 +198,45 @@ document.addEventListener("DOMContentLoaded", function () {
       fullChart = echarts.init(document.getElementById('fullChartContainer'));
     }
 
+    const isDualAxis = currentChartName === 'power';
+
     fullChart.setOption({
       title: { text: currentChartName.charAt(0).toUpperCase() + currentChartName.slice(1), textStyle: { color: '#fff' } },
-      tooltip: { trigger: 'axis' },
+      tooltip: {
+        trigger: 'axis',
+        formatter: function (params) {
+          return params.map(p => {
+            const label = p.seriesName.toLowerCase();
+            const unit = label.includes('volt') ? 'V' : label.includes('battery') ? '%' : '';
+            return `${p.marker} ${p.seriesName}: ${p.data}${unit}`;
+          }).join('<br>');
+        }
+      },
       xAxis: {
         type: 'category',
         data: currentChartData.timestamps,
         axisLabel: { color: '#fff', rotate: 45 },
       },
-      yAxis: {
+      yAxis: isDualAxis ? [
+        {
+          type: 'value',
+          name: 'Battery (%)',
+          min: 0,
+          max: 120,
+          position: 'left',
+          axisLabel: { color: '#fff' },
+          nameTextStyle: { color: '#fff' }
+        },
+        {
+          type: 'value',
+          name: 'Voltage (V)',
+          min: 0,
+          max: 6,
+          position: 'right',
+          axisLabel: { color: '#fff' },
+          nameTextStyle: { color: '#fff' }
+        }
+      ] : {
         type: 'value',
         axisLabel: { color: '#fff' },
       },
@@ -186,6 +247,7 @@ document.addEventListener("DOMContentLoaded", function () {
         smooth: true,
         connectNulls: true,
         showSymbol: false,
+        yAxisIndex: isDualAxis && s.name.toLowerCase().includes('volt') ? 1 : 0,
       })),
       legend: { textStyle: { color: '#fff' } }
     });
@@ -198,4 +260,4 @@ document.addEventListener("DOMContentLoaded", function () {
     if (currentChart) currentChart.resize();
   });
 });
-</script>
\ No newline at end of file
+</script>
diff --git a/meshview/web.py b/meshview/web.py
index e88d54b..e23edfb 100644
--- a/meshview/web.py
+++ b/meshview/web.py
@@ -568,9 +568,6 @@ async def graph_telemetry_json(node_id, payload_type, graph_config):
     })
 
 
-
-
-
 @routes.get("/graph/neighbors_json/{node_id}")
 async def graph_neighbors_json(request):
     import datetime