Battery might be weak

[taxfree4]

I replaced min 16 with a Yusa battery and I always have before on my wing's, But, I replaced mine in 2021. when I was. checking everything out this past May before cross country trip, checked the battery voltage and it 12.13, then steadily drops below 12 volts. As a retired electronics tech and mechanicing all my life, I replaced it with the above battery, Energizer. Very disappointed with Yusa!

Could it be you got a dud. I bought a 2016 last year and it looks like an original Yuasa, did a X-country last year, no problems, and will do Alaska this year with the same battery. I do keep it tendered, not sure if that makes a difference, you're the expert on that. Look at Ronald Reagan Jr., even the Gipper produces a hunk of $hyte every once in a while, then there's Patti Davis, maybe twice.