packages/SystemUI/res/drawable/qs_sys_battery_charging.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
** Copyright 2011, 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.
*/
-->

<level-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:maxLevel="4" android:drawable="@drawable/ic_qs_battery_charge_0" />
    <item android:maxLevel="15" android:drawable="@drawable/ic_qs_battery_charge_15" />
    <item android:maxLevel="35" android:drawable="@drawable/ic_qs_battery_charge_28" />
    <item android:maxLevel="49" android:drawable="@drawable/ic_qs_battery_charge_43" />
    <item android:maxLevel="60" android:drawable="@drawable/ic_qs_battery_charge_57" />
    <item android:maxLevel="75" android:drawable="@drawable/ic_qs_battery_charge_71" />
    <item android:maxLevel="90" android:drawable="@drawable/ic_qs_battery_charge_85" />
    <item android:maxLevel="100" android:drawable="@drawable/ic_qs_battery_charge_100" />
</level-list>