device/drawable-anydpi-v21/ic_battery_unknown_black_24dp.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
        android:width="24dp"
        android:height="24dp"
        android:viewportWidth="24.0"
        android:viewportHeight="24.0">
    <path
        android:fillColor="#FF000000"
        android:pathData="M15.67,4L14,4L14,2h-4v2L8.33,4C7.6,4 7,4.6 7,5.33v15.33C7,21.4 7.6,22 8.33,22h7.33c0.74,0 1.34,-0.6 1.34,-1.33L17,5.33C17,4.6 16.4,4 15.67,4zM12.95,17.95h-1.9v-1.9h1.9v1.9zM14.3,12.69s-0.38,0.42 -0.67,0.71c-0.48,0.48 -0.83,1.15 -0.83,1.6h-1.6c0,-0.83 0.46,-1.52 0.93,-2l0.93,-0.94c0.27,-0.27 0.44,-0.65 0.44,-1.06 0,-0.83 -0.67,-1.5 -1.5,-1.5s-1.5,0.67 -1.5,1.5L9,11c0,-1.66 1.34,-3 3,-3s3,1.34 3,3c0,0.66 -0.27,1.26 -0.7,1.69z"/>
</vector>