diff --git a/platformio.ini b/platformio.ini
index 81d113bb..6b79b58c 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -788,7 +788,7 @@ board_build.partitions = ${esp32.default_partitions}
 [env:esp32_ulc]
 board = esp32-poe
 build_unflags = ${common.build_unflags}
-build_flags = ${common.build_flags_esp32} -D WLED_RELEASE_NAME=ESP32_ULC -D RLYPIN=-1 -D WLED_USE_ETHERNET -D WLED_ETH_DEFAULT=6 -D LEDPIN=14 -D DEFAULT_LED_COUNT=37 -D APL_MILLIAMPS_DEFAULT=2500 -D BTNPIN=-1 -D WLED_DISABLE_BLYNK -D IRPIN=-1 -D USERMOD_ULC_BATTERYMANAGEMENT
+build_flags = ${common.build_flags_esp32} -D WLED_RELEASE_NAME=ESP32_ULC -D RLYPIN=-1 -D WLED_USE_ETHERNET -D WLED_ETH_DEFAULT=6 -D LEDPIN=14 -D DEFAULT_LED_COUNT=37 -D APL_MILLIAMPS_DEFAULT=2500 -D BTNPIN=-1 -D WLED_DISABLE_BLYNK -D IRPIN=-1 -D USERMOD_ULC_BATTERYMANAGEMENT -D I2CSDAPIN=32 -D I2CSCLPIN=33
 lib_deps = ${esp32.lib_deps}
 platform = espressif32@3.2
 board_build.partitions = ${esp32.default_partitions}
\ No newline at end of file
diff --git a/usermods/ULC_Battery_Management/IP5306_I2C.h b/usermods/ULC_Battery_Management/IP5306_I2C.h
index 2a9038ce..988c803b 100644
--- a/usermods/ULC_Battery_Management/IP5306_I2C.h
+++ b/usermods/ULC_Battery_Management/IP5306_I2C.h
@@ -194,12 +194,9 @@ union {
 
 class IP5306{
   public:
-    /*@brief initialize i2c 
-      @param sda and scl pin number
+    /*@brief initialize i2c
     */
-    IP5306(uint8_t sda_pin=21, uint8_t scl_pin=22) {
-      Wire.begin(sda_pin,scl_pin);
-
+    IP5306(void) {
       /*initialize register data*/
       reg_SYS_CTL0_t.reg_byte = i2c_read(IP5306_ADDRESS,SYS_CTL0);
       reg_SYS_CTL1_t.reg_byte = i2c_read(IP5306_ADDRESS,SYS_CTL1);
@@ -209,7 +206,6 @@ class IP5306{
       reg_Charger_CTL1_t.reg_byte = i2c_read(IP5306_ADDRESS,Charger_CTL1);
       reg_Charger_CTL2_t.reg_byte = i2c_read(IP5306_ADDRESS,Charger_CTL2);
       reg_Charger_CTL3_t.reg_byte = i2c_read(IP5306_ADDRESS,Charger_CTL3);
-
     }
 
     /*@brief  write data to register 
diff --git a/usermods/ULC_Battery_Management/usermod_ulc_batterymanagement.h b/usermods/ULC_Battery_Management/usermod_ulc_batterymanagement.h
index e3e9fd98..d96eeeef 100644
--- a/usermods/ULC_Battery_Management/usermod_ulc_batterymanagement.h
+++ b/usermods/ULC_Battery_Management/usermod_ulc_batterymanagement.h
@@ -9,14 +9,6 @@
   #define USERMOD_BATTERY_MEASUREMENT_INTERVAL 5000
 #endif
 
-#ifndef USERMOD_IP5306_SDA
-  #define USERMOD_IP5306_SDA 32
-#endif
-
-#ifndef USERMOD_IP5306_SCL
-  #define USERMOD_IP5306_SCL 33
-#endif
-
 #ifndef USERMOD_ABL_BATTERY
   #define USERMOD_ABL_BATTERY 1250
 #endif
@@ -61,6 +53,8 @@ class UsermodULCBatteryManagement : public Usermod {
   public:
 
     void setup() {
+      if (i2c_sda < 0 || i2c_scl < 0) return;
+
       ip5306 = new IP5306();
 
       nextReadTime = millis() + 5000;