Ei141 Replacement Smoke Alarm Bleeping

[Guest Mark]

Hi I have three Ei141 smoke alarms, one was bleeping and changing the battery didn’t resolve the problem. As all three were past their expiry date I have ordered replacements. Unfortunately, two of the three alarms are bleeping when the mains electricity is turned back on.
Would welcome any suggestions for how to resolve this problem
 

[green-foam]

Smoke alarm beeping roughly every 60 seconds is a sign of low standby battery.