No twi readings on battery

No twi readings on batteryhttps://devzone.nordicsemi.com/f/nordic-q-a/83252/no-twi-readings-on-batteryHi, I have strange problem. I have LSM9DS1 IMU connected to nrf52840. when i supply 3.3 V from external source (Nano 33 BLE) and to the J-link everything works. But if I switch to battery source (2 AAA batteries) 3V there are no readings from IMU. Iten-USTelligent Community 13Mon, 03 Jan 2022 12:42:15 GMTRE: No twi readings on batteryhttps://devzone.nordicsemi.com/thread/345661?ContentTypeID=1Mon, 03 Jan 2022 12:42:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5e4dbe5b-3a06-43c5-a119-6a3c6a86609fKenneth<p>You have connected GND between the two boards also? Is there a difference with/without j-link connected? Have you connected a logic analyzer to the twi?</p> <p>Kenneth</p><div style="clear:both;"></div>