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diff --git a/dom/battery/BatteryManager.h b/dom/battery/BatteryManager.h
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+++ b/dom/battery/BatteryManager.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_dom_battery_BatteryManager_h
+#define mozilla_dom_battery_BatteryManager_h
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/HalBatteryInformation.h"
+
+namespace mozilla {
+
+namespace hal {
+class BatteryInformation;
+}  // namespace hal
+
+namespace dom::battery {
+
+class BatteryManager : public DOMEventTargetHelper,
+                       public hal::BatteryObserver {
+ public:
+  explicit BatteryManager(nsPIDOMWindowInner* aWindow);
+
+  void Init();
+  void Shutdown();
+
+  // For IObserver.
+  void Notify(const hal::BatteryInformation& aBatteryInfo) override;
+
+  /**
+   * WebIDL Interface
+   */
+
+  nsPIDOMWindowInner* GetParentObject() const { return GetOwner(); }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  bool Charging() const;
+
+  double ChargingTime() const;
+
+  double DischargingTime() const;
+
+  double Level() const;
+
+  IMPL_EVENT_HANDLER(chargingchange)
+  IMPL_EVENT_HANDLER(chargingtimechange)
+  IMPL_EVENT_HANDLER(dischargingtimechange)
+  IMPL_EVENT_HANDLER(levelchange)
+
+ private:
+  /**
+   * Update the battery information stored in the battery manager object using
+   * a battery information object.
+   */
+  void UpdateFromBatteryInfo(const hal::BatteryInformation& aBatteryInfo);
+
+  /**
+   * Represents the battery level, ranging from 0.0 (dead or removed?)
+   * to 1.0 (fully charged)
+   */
+  double mLevel;
+  bool mCharging;
+  /**
+   * Represents the discharging time or the charging time, depending on the
+   * current battery status (charging or not).
+   */
+  double mRemainingTime;
+};
+
+}  // namespace dom::battery
+}  // namespace mozilla
+
+#endif  // mozilla_dom_battery_BatteryManager_h