I purchased an X2Power Premium AGM BCI Group 27F Car and Truck Battery G-27F in March of 2021 from Batteries Plus. The battery is in the Tundra with an after-market S-ALT diode that allows the charging system to charge the battery at 14.8v and I routinely see 14.7 and 14.8v at startup.
The first thing I did when the battery was new was top the battery off with a charger capable of charging an AGM. It did its thing saying it was fully charged and my BT charge monitoring confirmed it. I've done this several times because although it would show 100% charge immediately at the end of the charging even by the next morning it was at 90%.
A few months ago I started to see 90%, then 80%, then 70% capacity after sitting overnight. This morning it's cold and it's currently 46% and 12.26v. The truck still cranks right over. The cranking voltage is 10.40v and the average charging voltage at idle is 14.50v and the average charging voltage at high RPM is 14.58v.
The truck is driven every day at least 16 miles and most days more than that with a couple +1hour highway trips per month. I'm guessing this less than 2-year-old battery is dying?
The first thing I did when the battery was new was top the battery off with a charger capable of charging an AGM. It did its thing saying it was fully charged and my BT charge monitoring confirmed it. I've done this several times because although it would show 100% charge immediately at the end of the charging even by the next morning it was at 90%.
A few months ago I started to see 90%, then 80%, then 70% capacity after sitting overnight. This morning it's cold and it's currently 46% and 12.26v. The truck still cranks right over. The cranking voltage is 10.40v and the average charging voltage at idle is 14.50v and the average charging voltage at high RPM is 14.58v.
The truck is driven every day at least 16 miles and most days more than that with a couple +1hour highway trips per month. I'm guessing this less than 2-year-old battery is dying?