diff --git a/health/2.1/Android.bp b/health/2.1/Android.bp
new file mode 100644
index 0000000..254bfc0
--- /dev/null
+++ b/health/2.1/Android.bp
@@ -0,0 +1,20 @@
+// This file is autogenerated by hidl-gen -Landroidbp.
+
+hidl_interface {
+    name: "android.hardware.health@2.1",
+    root: "android.hardware",
+    vndk: {
+        enabled: true,
+    },
+    srcs: [
+        "types.hal",
+        "IHealth.hal",
+        "IHealthInfoCallback.hal",
+    ],
+    interfaces: [
+        "android.hardware.health@1.0",
+        "android.hardware.health@2.0",
+        "android.hidl.base@1.0",
+    ],
+    gen_java: true,
+}
diff --git a/health/2.1/IHealth.hal b/health/2.1/IHealth.hal
new file mode 100644
index 0000000..8a5152a
--- /dev/null
+++ b/health/2.1/IHealth.hal
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.health@2.1;
+
+import @2.0::IHealth;
+import @2.0::Result;
+import HealthConfig;
+import HealthInfo;
+import IHealthInfoCallback;
+
+/**
+ * IHealth manages health info and posts events on registered callbacks.
+ *
+ * An implementation of @2.1::IHealth must be able to handle both
+ * @2.0::IHealthInfoCallback and @2.1::IHealthInfoCallback.
+ * - When registerCallback() is called, an implementation must cast the callback
+ * to @2.1::IHealthInfoCallback.
+ *   - If the cast is successful, when a health info broadcast is sent, the
+ *     implementation must call
+ *     @2.1::IHealthInfoCallback.healthInfoChanged_2_1(). All fields introduced
+ *     in 2.1 must be set appropriately. The implementation must not call
+ *     @2.0::IHealthInfoCallback.healthInfoChanged().
+ *   - If the cast is unsuccessful, the implementation must call
+ *     @2.0::IHealthInfoCallback.healthInfoChanged().
+ * - When unregisterCallback() is called, from then on, updates must not be sent
+ *   through either healthInfoChanged_2_1() or healthInfoChanged().
+ *
+ * Passthrough implementations are not required to send health info to all
+ * callbacks periodically, but they must do so when update() is called.
+ * Binderized implementations must send health info to all callbacks
+ * periodically. The intervals between two notifications must be retrieved from
+ * the passthrough implementation through the getHealthConfig() function.
+ */
+interface IHealth extends @2.0::IHealth {
+    /**
+     * Get configuration of this HAL.
+     *
+     * @return result SUCCESS if successful,
+     *                NOT_SUPPORTED if this API is not supported,
+     *                UNKNOWN for other errors.
+     * @return config HAL configuration, to be ignored if result is not
+     *                SUCCESS.
+     */
+    getHealthConfig() generates (Result result, HealthConfig config);
+
+    /**
+     * Get Health Information.
+     *
+     * @return result SUCCESS if successful,
+     *                NOT_SUPPORTED if this API is not supported,
+     *                UNKNOWN for other errors.
+     * @return value  Health information, to be ignored if result is not
+     *                SUCCESS.
+     */
+    getHealthInfo_2_1() generates (Result result, @2.1::HealthInfo value);
+
+    /**
+     * Return whether the screen should be kept on in charger mode.
+     *
+     * @return result SUCCESS if successful,
+     *                NOT_SUPPORTED if this API is not supported,
+     *                UNKNOWN for other errors.
+     * @return value whether screen should be kept on.
+     */
+    shouldKeepScreenOn() generates (Result result, bool value);
+};
diff --git a/health/2.1/IHealthInfoCallback.hal b/health/2.1/IHealthInfoCallback.hal
new file mode 100644
index 0000000..275f018
--- /dev/null
+++ b/health/2.1/IHealthInfoCallback.hal
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.health@2.1;
+
+import @2.0::IHealthInfoCallback;
+
+/**
+ * IHealthInfoCallback is the updated callback interface to
+ * {@link IHealth.registerCallback}.
+ *
+ * A @2.1::IHealthInfoCallback must implement healthInfoChanged_2_1(). The
+ * inherited healthInfoChanged() function is never called when the HAL
+ * implementation post events. See documentation on @2.1::IHealth for details.
+ */
+interface IHealthInfoCallback extends @2.0::IHealthInfoCallback {
+    /**
+     * An implementation of IHealth must call healthInfoChanged on all
+     * registered callbacks after health info changes.
+     * @param info the updated HealthInfo
+     */
+    oneway healthInfoChanged_2_1(HealthInfo info);
+};
diff --git a/health/2.1/types.hal b/health/2.1/types.hal
new file mode 100644
index 0000000..efd8d6f
--- /dev/null
+++ b/health/2.1/types.hal
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.health@2.1;
+
+import @1.0::HealthConfig;
+import @2.0::HealthInfo;
+
+/**
+ * Battery capacity level. This enum provides additional information along side
+ * with the battery capacity.
+ * Clients of this HAL must use this value before inferring it from the
+ * battery capacity.
+ */
+enum BatteryCapacityLevel : int32_t {
+    /**
+     * Battery capacity level is unknown.
+     * Battery capacity level must be set to this value if and only if battery
+     * is not present.
+     */
+    UNKNOWN = 0,
+    /**
+     * Battery is at critical level. The Android framework must schedule a
+     * shutdown when it sees this value from the HAL.
+     */
+    CRITICAL,
+    /**
+     * Battery is low. The Android framework may limit the performance of
+     * the device when it sees this value from the HAL.
+     */
+    LOW,
+    /**
+     * Battery level is normal.
+     */
+    NORMAL,
+    /**
+     * Battery level is high.
+     */
+    HIGH,
+    /**
+     * Battery is full. It must be set to FULL if and only if battery level is
+     * 100.
+     */
+    FULL,
+};
+
+/**
+ * Combined Health Information.
+ */
+struct HealthInfo {
+    /**
+     * V2.0 HealthInfo.
+     * If a member is unsupported, it is filled with:
+     * - 0 (for integers);
+     * - false (for booleans);
+     * - empty string (for strings);
+     * - UNKNOWN (for BatteryStatus and BatteryHealth).
+     */
+    @2.0::HealthInfo legacy;
+
+    /**
+     * Battery capacity level. See BatteryCapacityLevel for more details.
+     */
+    BatteryCapacityLevel batteryCapacityLevel;
+
+    /**
+     * Estimated time to fully charge the device (in seconds).
+     * Value must be 0 if and only if batteryCapacityLevel is FULL or UNKNOWN.
+     * Otherwise, value must be positive.
+     */
+    int64_t batteryChargeTimeToFullNowSeconds;
+
+    /**
+     * Estimated battery full capacity (in microamp hours, uAh).
+     * Value must be 0 if unknown.
+     * Value must be positive if known, and must be between [50%, 120%] of
+     * batteryFullCharge (the designed capacity).
+     */
+    int32_t batteryFullCapacityUah;
+};
+
+/**
+ * Combined configuration of a health HAL implementation.
+ */
+struct HealthConfig {
+    /**
+     * 1.0 version of health config.
+     */
+    @1.0::HealthConfig battery;
+
+    /**
+     * Minimum battery level for charger to reboot into Android (in percent).
+     * Value should be in range [0, 100].
+     */
+    int32_t bootMinCap;
+};
diff --git a/health/2.1/vts/OWNERS b/health/2.1/vts/OWNERS
new file mode 100644
index 0000000..20450ba
--- /dev/null
+++ b/health/2.1/vts/OWNERS
@@ -0,0 +1,3 @@
+elsk@google.com
+hridya@google.com
+sspatil@google.com
diff --git a/health/2.1/vts/functional/Android.bp b/health/2.1/vts/functional/Android.bp
new file mode 100644
index 0000000..5aa873a
--- /dev/null
+++ b/health/2.1/vts/functional/Android.bp
@@ -0,0 +1,29 @@
+//
+// Copyright (C) 2019 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+cc_test {
+    name: "VtsHalHealthV2_1TargetTest",
+    defaults: ["VtsHalTargetTestDefaults"],
+    srcs: ["VtsHalHealthV2_1TargetTest.cpp"],
+    static_libs: [
+        "libgflags",
+        "libgmock",
+        "android.hardware.health@1.0",
+        "android.hardware.health@2.0",
+        "android.hardware.health@2.1",
+    ],
+    test_suites: ["general-tests"],
+}
diff --git a/health/2.1/vts/functional/VtsHalHealthV2_1TargetTest.cpp b/health/2.1/vts/functional/VtsHalHealthV2_1TargetTest.cpp
new file mode 100644
index 0000000..7df4926
--- /dev/null
+++ b/health/2.1/vts/functional/VtsHalHealthV2_1TargetTest.cpp
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "health_hidl_hal_test"
+
+#include <mutex>
+#include <set>
+#include <string>
+
+#include <android-base/logging.h>
+#include <android/hardware/health/1.0/types.h>
+#include <android/hardware/health/2.0/types.h>
+#include <android/hardware/health/2.1/IHealth.h>
+#include <android/hardware/health/2.1/IHealthInfoCallback.h>
+#include <android/hardware/health/2.1/types.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+#include <hidl/GtestPrinter.h>
+#include <hidl/ServiceManagement.h>
+
+using ::android::hardware::health::V1_0::BatteryStatus;
+using ::android::hardware::health::V2_0::Result;
+using ::testing::AnyOf;
+using ::testing::AssertionFailure;
+using ::testing::AssertionResult;
+using ::testing::AssertionSuccess;
+using namespace std::chrono_literals;
+
+using ::android::hardware::health::V1_0::toString;
+using ::android::hardware::health::V2_0::toString;
+using ::android::hardware::health::V2_1::toString;
+
+// Return expr if it is evaluated to false.
+#define TEST_AND_RETURN(expr) \
+    do {                      \
+        auto res = (expr);    \
+        if (!res) return res; \
+    } while (0)
+
+// Return a descriptive AssertionFailure() if expr is evaluated to false.
+#define TEST_AND_RETURN_FAILURE(expr)                       \
+    do {                                                    \
+        auto res = (expr);                                  \
+        if (!res) {                                         \
+            return AssertionFailure() << #expr " is false"; \
+        }                                                   \
+    } while (0)
+
+namespace android {
+namespace hardware {
+namespace health {
+
+namespace V2_0 {
+std::ostream& operator<<(std::ostream& os, const Result& res) {
+    return os << toString(res);
+}
+}  // namespace V2_0
+
+namespace V2_1 {
+
+class HealthHidlTest : public testing::TestWithParam<std::string> {
+  public:
+    virtual void SetUp() override {
+        service_ = IHealth::getService(GetParam());
+        ASSERT_NE(nullptr, service_.get()) << "Instance '" << GetParam() << "'' is not available.";
+    }
+
+    sp<IHealth> service_;
+};
+
+class CallbackBase {
+  public:
+    Return<void> healthInfoChangedInternal() {
+        std::lock_guard<std::mutex> lock(mutex_);
+        invoked_ = true;
+        invoked_notify_.notify_all();
+        return Void();
+    }
+    template <typename R, typename P>
+    bool waitInvoke(std::chrono::duration<R, P> duration) {
+        std::unique_lock<std::mutex> lock(mutex_);
+        bool r = invoked_notify_.wait_for(lock, duration, [this] { return this->invoked_; });
+        invoked_ = false;
+        return r;
+    }
+
+  private:
+    std::mutex mutex_;
+    std::condition_variable invoked_notify_;
+    bool invoked_ = false;
+};
+
+class Callback_2_0 : public android::hardware::health::V2_0::IHealthInfoCallback,
+                     public CallbackBase {
+    Return<void> healthInfoChanged(const android::hardware::health::V2_0::HealthInfo&) override {
+        return healthInfoChangedInternal();
+    }
+};
+
+class Callback_2_1 : public android::hardware::health::V2_1::IHealthInfoCallback,
+                     public CallbackBase {
+    Return<void> healthInfoChanged(const android::hardware::health::V2_0::HealthInfo&) override {
+        ADD_FAILURE() << "android::hardware::health::V2_1::IHealthInfoCallback::healthInfoChanged "
+                      << "is called, but it shouldn't be";
+        return Void();
+    }
+    Return<void> healthInfoChanged_2_1(const HealthInfo&) override {
+        return healthInfoChangedInternal();
+    }
+};
+
+template <typename T>
+AssertionResult IsOk(const Return<T>& r) {
+    return r.isOk() ? AssertionSuccess() : (AssertionFailure() << r.description());
+}
+
+// Both IsOk() and Result::SUCCESS
+AssertionResult ResultIsSuccess(const Return<Result>& r) {
+    if (!r.isOk()) {
+        return AssertionFailure() << r.description();
+    }
+    if (static_cast<Result>(r) != Result::SUCCESS) {
+        return AssertionFailure() << toString(static_cast<Result>(r));
+    }
+    return AssertionSuccess();
+}
+
+/**
+ * Test whether callbacks work. Tested functions are IHealth::registerCallback,
+ * unregisterCallback, and update.
+ */
+template <typename Callback>
+AssertionResult TestCallbacks(sp<IHealth> service) {
+    sp<Callback> first = new Callback();
+    sp<Callback> second = new Callback();
+
+    TEST_AND_RETURN(ResultIsSuccess(service->registerCallback(first)));
+    TEST_AND_RETURN(ResultIsSuccess(service->registerCallback(second)));
+
+    // registerCallback may or may not invoke the callback immediately, so the test needs
+    // to wait for the invocation. If the implementation chooses not to invoke the callback
+    // immediately, just wait for some time.
+    first->waitInvoke(200ms);
+    second->waitInvoke(200ms);
+
+    // assert that the first callback is invoked when update is called.
+    TEST_AND_RETURN(ResultIsSuccess(service->update()));
+
+    TEST_AND_RETURN_FAILURE(first->waitInvoke(1s));
+    TEST_AND_RETURN_FAILURE(second->waitInvoke(1s));
+
+    TEST_AND_RETURN(ResultIsSuccess(service->unregisterCallback(first)));
+
+    // clear any potentially pending callbacks result from wakealarm / kernel events
+    // If there is none, just wait for some time.
+    first->waitInvoke(200ms);
+    second->waitInvoke(200ms);
+
+    // assert that the second callback is still invoked even though the first is unregistered.
+    TEST_AND_RETURN(ResultIsSuccess(service->update()));
+
+    TEST_AND_RETURN_FAILURE(!first->waitInvoke(200ms));
+    TEST_AND_RETURN_FAILURE(second->waitInvoke(1s));
+
+    TEST_AND_RETURN(ResultIsSuccess(service->unregisterCallback(second)));
+    return AssertionSuccess();
+}
+
+TEST_P(HealthHidlTest, Callbacks_2_0) {
+    EXPECT_TRUE(TestCallbacks<Callback_2_0>(service_));
+}
+
+TEST_P(HealthHidlTest, Callbacks_2_1) {
+    EXPECT_TRUE(TestCallbacks<Callback_2_1>(service_));
+}
+
+template <typename Callback>
+AssertionResult TestUnregisterNonExistentCallback(sp<IHealth> service) {
+    sp<Callback> callback = new Callback();
+    auto ret = service->unregisterCallback(callback);
+    TEST_AND_RETURN(IsOk(ret));
+    if (static_cast<Result>(ret) != Result::NOT_FOUND) {
+        return AssertionFailure()
+               << "Unregistering non-existent callback should return NOT_FOUND, but returned "
+               << static_cast<Result>(ret);
+    }
+    return AssertionSuccess();
+}
+
+TEST_P(HealthHidlTest, UnregisterNonExistentCallback_2_0) {
+    EXPECT_TRUE(TestUnregisterNonExistentCallback<Callback_2_0>(service_));
+}
+
+TEST_P(HealthHidlTest, UnregisterNonExistentCallback_2_1) {
+    EXPECT_TRUE(TestUnregisterNonExistentCallback<Callback_2_1>(service_));
+}
+
+template <typename T>
+AssertionResult IsEnum(T value) {
+    for (auto it : hidl_enum_range<T>()) {
+        if (it == value) {
+            return AssertionSuccess();
+        }
+    }
+
+    return AssertionFailure() << static_cast<std::underlying_type_t<T>>(value) << " is not valid";
+}
+
+/*
+ * Tests the values returned by getHealthInfo() from interface IHealth.
+ */
+TEST_P(HealthHidlTest, getHealthInfo_2_1) {
+    EXPECT_TRUE(IsOk(service_->getHealthInfo_2_1([](auto result, const auto& value) {
+        if (result == Result::NOT_SUPPORTED) {
+            return;
+        }
+        ASSERT_EQ(Result::SUCCESS, result);
+        const auto& legacy = value.legacy.legacy;
+
+        EXPECT_TRUE(IsEnum(value.batteryCapacityLevel)) << " BatteryCapacityLevel";
+        EXPECT_GE(value.batteryChargeTimeToFullNowSeconds, 0);
+
+        EXPECT_GE(value.batteryFullCapacityUah, 0) << "batteryFullCapacityUah is unknown";
+        EXPECT_GE(value.batteryFullCapacityUah, legacy.batteryFullCharge * 0.50);
+        EXPECT_LE(value.batteryFullCapacityUah, legacy.batteryFullCharge * 1.20);
+    })));
+}
+
+TEST_P(HealthHidlTest, getHealthConfig) {
+    EXPECT_TRUE(IsOk(service_->getHealthConfig([](auto result, const auto&) {
+        EXPECT_THAT(result, AnyOf(Result::SUCCESS, Result::NOT_SUPPORTED));
+    })));
+}
+
+TEST_P(HealthHidlTest, shouldKeepScreenOn) {
+    EXPECT_TRUE(IsOk(service_->shouldKeepScreenOn([](auto result, const auto&) {
+        EXPECT_THAT(result, AnyOf(Result::SUCCESS, Result::NOT_SUPPORTED));
+    })));
+}
+
+INSTANTIATE_TEST_SUITE_P(
+        , HealthHidlTest,
+        testing::ValuesIn(android::hardware::getAllHalInstanceNames(IHealth::descriptor)),
+        android::hardware::PrintInstanceNameToString);
+
+}  // namespace V2_1
+}  // namespace health
+}  // namespace hardware
+}  // namespace android
+
+int main(int argc, char** argv) {
+    ::testing::InitGoogleTest(&argc, argv);
+    int status = RUN_ALL_TESTS();
+    LOG(INFO) << "Test result = " << status;
+    return status;
+}