Hello, I too am affected by the "battery performance program" and I have only about 15 charge cycles till my phone will be gimped.
I contacted Google about the issue and they are apparently unable to verify that I own the phone because I use GrapheneOS, claiming I am not logged in to my Google account on the phone and urging me to do a full OS reset to stock which I really don't want to do.
Anyone in a similar situation or with cues as to how to "log in" to my account on the phone? I am logged into sandboxed Google Play services but apparently that is not enough for them.