Heiman zigbee smoke detector battery drain

Hi all,
I have bought a Heiman HS1SA-E Zigbee smoke detector. I have configured it correctly with Zigbee2mqtt but what I have noticed is that it drains the battery in about 3 weeks.
I have tried buying a higher quality battery but the difference is negligible.
Has anyone else had this happen? Could it be a device issue?
Thanks in advance.