diff --git a/.DS_Store b/.DS_Store
index d1579ac..046bdd8 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/README.md b/README.md
index da85a07..1ff2b08 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 ## 展示
 ![workday](https://raw.githubusercontent.com/217heidai/eInkCalendar/main/doc/workday.jpeg)
 ![holiday](https://raw.githubusercontent.com/217heidai/eInkCalendar/main/doc/holiday.jpeg)
+![battery](https://raw.githubusercontent.com/217heidai/eInkCalendar/main/doc/battery.jpeg)
 
 ## 功能
 1. 日历信息展示，包括日期、星期、农历、节假日；
@@ -14,8 +15,7 @@
 6. 每 8 小时（具体见代码中 `REFRESH_FREQUENCY` 定义）联网刷新一次日期、天气信息。如日期发生变化，则强制刷新。
 
 ## 计划
-1. 采集、展示电量；
-2. 翻页展示更多功能...
+1. 翻页展示更多功能...
 
 ## 电路图
 1. 电路图`doc/SCH_三色墨水屏日历_2021-07-23.json`，请使用 立创EDA 打开
@@ -32,11 +32,14 @@
 3. `eInkCalendar.ino`中修改位置信息，支持到城市级别，设置 `url_FutureWeather`、`url_LifeIndex`。
 
 ## 更新日志
+### 0.0.3【2021/12/15】
+1. 增加电量显示，绘制电池图标
+   
 ### 0.0.2【2021/12/08】
 1. 参考`甘草酸不酸`大佬的源码，修复了 `U8g2_for_Adafruit_GFX` 库崩溃问题，源码详见 lib 目录；
 2. 为了省电，调整为每 8 小时（具体见代码中 `REFRESH_FREQUENCY` 定义）联网刷新一次日期、天气信息。当然如日期发生变化，则会强制刷新；
 3. 拆机发现板子上没有温湿度模块，只能问候下 JS 了。
 
 ### 0.0.1【2021/08/19】
-1. 初始版本
+1. 初始版本。
 
diff --git a/doc/.DS_Store b/doc/.DS_Store
new file mode 100644
index 0000000..5008ddf
Binary files /dev/null and b/doc/.DS_Store differ
diff --git a/doc/battery.jpeg b/doc/battery.jpeg
new file mode 100644
index 0000000..28ddb5c
Binary files /dev/null and b/doc/battery.jpeg differ
diff --git a/doc/workday.jpeg b/doc/workday.jpeg
index c2936df..f81e892 100644
Binary files a/doc/workday.jpeg and b/doc/workday.jpeg differ
diff --git a/src/bitmap.cpp b/src/bitmap.cpp
index 26af18c..b47706e 100755
--- a/src/bitmap.cpp
+++ b/src/bitmap.cpp
@@ -119,7 +119,7 @@ const unsigned char Bitmap_gengxing[] PROGMEM =  { 0x9f, 0xf8, 0xc3, 0x98, 0xc3,
 const unsigned char Bitmap_riqi[] PROGMEM =  { 0xff, 0xfc, 0x3f, 0xff, 0x0f, 0xff, 0xc0, 0xff, 0xf8, 0x3f, 0xff, 0x07, 0xff, 0xc0, 0xff, 0xf0, 0x1f, 0xfe, 0x03, 0xff, 0xc0, 0xff, 0xf0, 0x1f, 0xfe, 0x03, 0xff, 0xc0, 0xff, 0xf0, 0x1f, 0xfe, 0x03, 0xff, 0xc0, 0xff, 0xf0, 0x1f, 0xfe, 0x03, 0xff, 0xc0, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xc0, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x0f, 0xf8, 0x1f, 0xfe, 0x07, 0xfc, 0x00, 0x0f, 0xf8, 0x3f, 0xff, 0x07, 0xfc, 0x00, 0x1f, 0xfc, 0x7f, 0xff, 0x8f, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0x80, 0xfc, 0x0f, 0xc0, 0x7e, 0x00, 0x1f, 0x80, 0xfc, 0x0f, 0xc0, 0x7e, 0x00, 0x1f, 0x80, 0xfc, 0x0f, 0xc0, 0x7e, 0x00, 0x1f, 0xc1, 0xfc, 0x0f, 0xe0, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0x80, 0xfc, 0x0f, 0xc0, 0x7e, 0x00, 0x1f, 0x80, 0xfc, 0x0f, 0xc0, 0x7e, 0x00, 0x1f, 0x80, 0xfc, 0x0f, 0xc0, 0x7e, 0x00, 0x1f, 0x80, 0xfc, 0x0f, 0xc0, 0x7e, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x00, 0x03, 0xff, 0xff, 0xff, 0xff, 0xf0, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0xc0, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x01, 0xc0 };
 
 //电量低中图标 width: 24, height: 35
-const unsigned char Bitmap_batlow[] PROGMEM =  { 0xfe, 0x00, 0xff, 0xfe, 0x00, 0xff, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x18, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x01 };
+const unsigned char Bitmap_BAT_LOW[] PROGMEM =  { 0xfe, 0x00, 0xff, 0xfe, 0x00, 0xff, 0x80, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x7e, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x18, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x01 };
 
 //湿度小图标 width: 13, height: 13
 const unsigned char Bitmap_humidity[] PROGMEM = { 0xfc, 0xf8, 0xf8, 0xf8, 0xf2, 0x78, 0xe7, 0x38, 0xcf, 0x98, 0xcf, 0x98, 0x9f, 0xc8, 0x9f, 0xc8, 0x9e, 0x48, 0x9c, 0xc8, 0xcd, 0x98, 0xe3, 0x18, 0xf0, 0x78 };
diff --git a/src/bitmap.h b/src/bitmap.h
index dd0f870..c098dcb 100644
--- a/src/bitmap.h
+++ b/src/bitmap.h
@@ -39,7 +39,7 @@ extern const unsigned char Bitmap_weizhi[];
 extern const unsigned char Bitmap_zhuangtai[];
 extern const unsigned char Bitmap_gengxing[];
 extern const unsigned char Bitmap_riqi[];
-extern const unsigned char Bitmap_batlow[];
+extern const unsigned char Bitmap_BAT_LOW[];
 extern const unsigned char Bitmap_humidity[];
 extern const unsigned char Bitmap_fx[];
 extern const unsigned char Bitmap_rdfb[];
diff --git a/src/display.ino b/src/display.ino
index c1d418f..c3bddff 100644
--- a/src/display.ino
+++ b/src/display.ino
@@ -12,6 +12,8 @@ extern void display_setup(void)
   //display_test_number();
   //display_test_weather();
   //display_test_str();
+  //display_test_battery();
+  //esp_sleep(SLEEP_TIME);
 }
 
 static void GetWeekday(char *pszWeekday, uint8_t nWeekday)
@@ -296,6 +298,39 @@ static bool RefreshHitokoto(void)
   return true;
 }
 
+static void RefreshBattery(void)
+{
+  //电量百分比
+  uint8_t percentage = bat_get_percentage();
+  
+  //电量图标
+  int16_t x_start = 3;
+  int16_t y_start = SCREEN_HEIGTH - FONT_SIZE_CHINESE_SPACING;
+  int16_t head_width  = 3;
+  int16_t head_height = 6;
+  int16_t body_width  = 24;
+  int16_t body_height = 14;
+  int16_t full_width  = (body_width - 2 - 2) * percentage / 100; //填充宽度
+  int16_t full_height = body_height - 2 - 2; //填充高度，留1像素间隙
+  uint16_t color = COLOR_BLACK; //颜色
+  if(percentage <= 10) color = COLOR_RED; //低于10%使用红色
+  //head
+  int16_t x_head = x_start;
+  int16_t y_head = y_start + (FONT_SIZE_CHINESE_SPACING - body_height)/2 + (body_height - head_height)/2;
+  display.fillRect(x_head, y_head, head_width, head_height, color);
+  //body
+  int16_t x_body = x_head + head_width;
+  int16_t y_body = y_start + (FONT_SIZE_CHINESE_SPACING - body_height)/2;
+  display.drawRect(x_body, y_body, body_width, body_height, color);
+  //full
+  if(percentage >= 5)
+  {
+    int16_t x_full = x_body + 2 + (body_width - 2 - 2) - full_width;
+    int16_t y_full = y_start + (FONT_SIZE_CHINESE_SPACING - full_height)/2;
+    display.fillRect(x_full, y_full, full_width, full_height, color);
+  }
+}
+
 extern void display_MainPage(void)
 {
   display.setPartialWindow(0, 0, SCREEN_WIDTH, SCREEN_HEIGTH); //设置全局刷新
@@ -306,6 +341,7 @@ extern void display_MainPage(void)
     RefreshWeather();//刷新天气
     RefreshLifeIndex();//刷新天气指数
     RefreshHitokoto();//刷新一言
+    RefreshBattery();//刷新电量
   }
   while (display.nextPage());
 }
diff --git a/src/eInkCalendar.ino b/src/eInkCalendar.ino
index 5835b34..c12989b 100644
--- a/src/eInkCalendar.ino
+++ b/src/eInkCalendar.ino
@@ -13,7 +13,13 @@
 #include "bitmap.h"
 
 //按键定义
-#define KEY_UP    5
+#define KEY_UP            5  //上方按键
+#define KEY_DOWN         EN  //下方按键
+//电量读取PIN
+#define BAT_PIN_SWITCH   12  //电池电压读取开关
+#define BAT_PIN_VCC      A0  //读取电池电压引脚
+#define BAT_FULL        4.2  //满电压
+#define BAT_LOW         3.2  //低电压
 
 //U8g2显示
 U8G2_FOR_ADAFRUIT_GFX u8g2Fonts;
diff --git a/src/test.ino b/src/test.ino
index 9700e3b..950f2eb 100644
--- a/src/test.ino
+++ b/src/test.ino
@@ -98,5 +98,56 @@ extern void display_test_weather() //图标测试
   display.drawInvertedBitmap(0, 200, Bitmap_zx_ws, 45, 45, COLOR_BLACK);
   display.drawInvertedBitmap(50, 200, Bitmap_weizhi, 13, 13, COLOR_BLACK);
 
+  display.display(1);
+}
+
+static void test_battery(uint8_t percentage, int16_t x_start)
+{
+  //电量百分比
+  //uint8_t percentage = bat_get_percentage();
+
+  //电量图标
+  //int16_t x_start = 3;
+  int16_t y_start = SCREEN_HEIGTH - FONT_SIZE_CHINESE_SPACING;
+  int16_t head_width  = 3;
+  int16_t head_height = 6;
+  int16_t body_width  = 24;
+  int16_t body_height = 14;
+  int16_t full_width  = (body_width - 2 - 2) * percentage / 100; //填充宽度
+  int16_t full_height = body_height - 2 - 2; //填充高度，留1像素间隙
+  uint16_t color = COLOR_BLACK; //颜色
+  if(percentage <= 10) color = COLOR_RED; //低于10%使用红色
+  //head
+  int16_t x_head = x_start;
+  int16_t y_head = y_start + (FONT_SIZE_CHINESE_SPACING - body_height)/2 + (body_height - head_height)/2;
+  display.fillRect(x_head, y_head, head_width, head_height, color);
+  //body
+  int16_t x_body = x_head + head_width;
+  int16_t y_body = y_start + (FONT_SIZE_CHINESE_SPACING - body_height)/2;
+  display.drawRect(x_body, y_body, body_width, body_height, color);
+  //full
+  if(percentage >= 5)
+  {
+    int16_t x_full = x_body + 2 + (body_width - 2 - 2) - full_width;
+    int16_t y_full = y_start + (FONT_SIZE_CHINESE_SPACING - full_height)/2;
+    display.fillRect(x_full, y_full, full_width, full_height, color);
+  }
+}
+
+extern void display_test_battery(void)
+{
+  display.fillScreen(COLOR_WHITE);  // 填充屏幕
+  display.display(1);         // 显示缓冲内容到屏幕，用于全屏缓冲
+
+  test_battery(100,  3);
+  test_battery( 90, 33);
+  test_battery( 70, 63);
+  test_battery( 50, 93);
+  test_battery( 30, 123);
+  test_battery( 10, 153);
+  test_battery(  5, 183);
+  test_battery(  3, 213);
+  test_battery(  0, 243);
+
   display.display(1);
 }
\ No newline at end of file
diff --git a/src/util.ino b/src/util.ino
index 95c2917..815d8b9 100644
--- a/src/util.ino
+++ b/src/util.ino
@@ -31,7 +31,6 @@ extern void SetForegroundColorBLACK(void)
   u8g2Fonts.setBackgroundColor(COLOR_WHITE);  // 设置背景色
 }
 
-
 //系统休眠
 extern void esp_sleep(uint32_t minutes)
 {
@@ -56,4 +55,39 @@ extern void led_controller(bool controller)
 
     pinMode(LED_BUILTIN, INPUT);
   }
+}
+
+//获取电压
+static float bat_get_vcc(void) //即时的电压
+{
+  pinMode(BAT_PIN_SWITCH, OUTPUT);
+  digitalWrite(BAT_PIN_SWITCH, 1);
+  delay(1);
+  float vcc_cache = 0.0;
+  for (uint8_t i = 0; i < 20; i++)
+  {
+    //delay(1);
+    vcc_cache += analogRead(BAT_PIN_VCC) * 0.0009765625 * 5.537;
+  }
+  digitalWrite(BAT_PIN_SWITCH, 0); //关闭电池测量
+  pinMode(BAT_PIN_SWITCH, INPUT);  //改为输入状态避免漏电
+  return (vcc_cache / 20);
+}
+
+//获取电量百分比
+extern float bat_get_percentage(void)
+{
+  float vcc = 0.0;
+  float percentage = 0.0;
+  
+  vcc = bat_get_vcc();
+  
+  //低电量
+  if(vcc > BAT_LOW)
+  {
+    percentage = ((vcc - BAT_LOW) / (BAT_FULL - BAT_LOW)) * 100 + 0.5; //计算百分比
+    if (percentage > 100) percentage = 100.0;
+  }
+
+  return percentage;
 }
\ No newline at end of file
diff --git a/src/wifi.ino b/src/wifi.ino
index d60f714..1f6312d 100644
--- a/src/wifi.ino
+++ b/src/wifi.ino
@@ -39,6 +39,7 @@ extern String callHttps(const char *url)
   client->setBufferSizes(512, 512);
 
   HTTPClient https;
+  https.setReuse(false); //是否keep-alive
 
   Serial.printf("[HTTPS] begin... url: %s\n", url);
   if (https.begin(*client, String(url))) {  // HTTPS