i bought 4x RuuviTags approx. 1,5 years ago and one of the RuuviTags drain a battery in ~115days, the other three run still on their first battery.
I measured the average current draw from the battery at 3.0V and a good one has ~35µA and the faulty one has ~250µA.
Other than the high current draw everything works fine, measurements of all sensors are working and the PCB looks good to me.
Has anyone had a similar RuuviTag with high battery drain?
I used the ‘fault / high battery drain’ RuuviTag in the beginning to flash a different firmware (i compiled the original RuuviTag Firmware myself and tried to change the settings to make it send less often).
After discovering the ‘longlife/longmem’ firmware i flashed it and used it until now. As the first battery went out i inserted a new one and it took ~115days for the battery to reach 2.0V.
I do not know if the high current was there when i bought it or if something was changed by the firmware or flashing the RuuviTag. Maybe there are fuses in the nRF chip?
Yesterday i used the nRF Connect Software to erase the whole chip, programm v3.32.0-RC3_full and then use the RuuviTag App to update OTA to v3.31.0. The current draw before and after flashing was the same so i do not think the firmware flashed to the RuuviTag is at fault here.
I measured the I²C pull-ups (they are both 1k as in the schematic) and looked at the PCB under a microscope and did not see anything suspicious.
Any suggestions on where to look or what to check next?