diff --git a/components/charts/BatteryLifeChart.tsx b/components/charts/BatteryLifeChart.tsx
new file mode 100644
index 0000000..488d58e
--- /dev/null
+++ b/components/charts/BatteryLifeChart.tsx
@@ -0,0 +1,101 @@
+"use client"
+
+import { EChartWrapper, getDeviceColor } from "./EChartWrapper"
+
+interface BatteryLifePoint {
+  id: string
+  hardwareSlug: string
+  tdpWatts: number
+  estimatedBatteryMin: number
+  estimatedBatteryHours: number
+  wattHours: number | null
+  tdpMax: number | null
+  estimatedAtMaxTdpMin: number | null
+}
+
+interface BatteryLifeChartProps {
+  data: BatteryLifePoint[]
+  deviceNames?: Record<string, string>
+}
+
+export function BatteryLifeChart({ data, deviceNames }: BatteryLifeChartProps) {
+  if (!data || data.length === 0) {
+    return <div className="flex items-center justify-center h-48 text-sm text-text/40">No battery data available</div>
+  }
+
+  // Group by device for separate series
+  const deviceGroups = new Map<string, BatteryLifePoint[]>()
+  for (const point of data) {
+    const existing = deviceGroups.get(point.hardwareSlug) || []
+    existing.push(point)
+    deviceGroups.set(point.hardwareSlug, existing)
+  }
+
+  // Build trend lines: for each device, compute wattHours / tdp = hours for a range of TDPs
+  const series: any[] = []
+  let seriesIdx = 0
+
+  for (const [slug, points] of deviceGroups.entries()) {
+    const color = getDeviceColor(seriesIdx)
+    const name = deviceNames?.[slug] || slug
+
+    // Scatter points: TDP vs battery hours
+    series.push({
+      name,
+      type: "scatter" as const,
+      data: points.map((p) => [p.tdpWatts, p.estimatedBatteryHours]),
+      itemStyle: { color },
+      symbolSize: 10,
+    })
+
+    // Trend line: compute theoretical curve using average wattHours for this device
+    const avgWh = points.reduce((sum, p) => sum + (p.wattHours ?? 0), 0) / points.length
+    if (avgWh > 0) {
+      const tdpRange = [2, 5, 8, 10, 12, 15, 18, 20, 25, 30].filter(
+        (tdp) => tdp <= (points[0].tdpMax ?? 30),
+      )
+      series.push({
+        name: `${name} (est.)`,
+        type: "line" as const,
+        data: tdpRange.map((tdp) => [tdp, Math.round((avgWh / tdp) * 10) / 10]),
+        lineStyle: { color, type: "dashed" as const, width: 1 },
+        symbol: "none",
+        silent: true,
+      })
+    }
+
+    seriesIdx++
+  }
+
+  const option = {
+    tooltip: {
+      trigger: "item" as const,
+      formatter: (params: any) => {
+        if (params.seriesName.includes("(est.)")) return ""
+        return `${params.seriesName}<br/>TDP: ${params.value[0]}W<br/>Battery: ~${params.value[1]}h`
+      },
+    },
+    legend: {
+      textStyle: { color: "#999" },
+      top: 0,
+    },
+    grid: { left: 60, right: 20, top: 40, bottom: 40 },
+    xAxis: {
+      type: "value" as const,
+      name: "TDP (W)",
+      nameTextStyle: { color: "#999" },
+      splitLine: { lineStyle: { color: "#333" } },
+      axisLabel: { color: "#999" },
+    },
+    yAxis: {
+      type: "value" as const,
+      name: "Battery (h)",
+      nameTextStyle: { color: "#999" },
+      splitLine: { lineStyle: { color: "#333" } },
+      axisLabel: { color: "#999" },
+    },
+    series,
+  }
+
+  return <EChartWrapper option={option} height={300} />
+}