Removed from site after I asked for a letter stating that. We are a 'barehand' lineman electrical crew, who constantly deals with 69kV-500kV live lines, so an AED is the cornerstone of our 1st Aid kit. In Oct. of 2022, I mentioned that our AEDs on-site were expiring early 2023. I was told corporate was purchasing new ones to distribute when we returned to work this week. Monthly safety meeting and I ask what the status is of the new units, I was told there is a delay and to continue using existing units 'until the red wrench illuminates' on the unit, even though they have expiration dates stamped on pads. I asked for a letter to put with machines and told its just verbal. Meeting ends abruptly and I am immediately called afterwards and told that I am being replaced.