#include <Arduino.h>
#include <U8g2lib.h>
#include <Wire.h>

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

static const unsigned char batt[] U8X8_PROGMEM = {
  0xfc, 0xff, 0x3f,
  0x04, 0x00, 0x20,
  0x07, 0x00, 0x20,
  0x05, 0x00, 0x20,
  0x05, 0x00, 0x20,
  0x07, 0x00, 0x20,
  0x04, 0x00, 0x20,
  0xfc, 0xff, 0x3f
};

void setup() {
  u8g2.begin();
  u8g2.clearBuffer();
  u8g2.drawXBMP(35, 20, 22, 8, batt);
  u8g2.sendBuffer();
}

void loop(void) {}