This is my third battery, brand new, out of the box….
this one, silver batt 9000 120ah 1000cca per advertised and per label.
I’m sick of batteries!
What's the output from your alternator? 1000 CCA will be a calcium battery and need a set point over 14 volts, preferably 14.5 V or more. Older alternators only kicked out 13.8 V which will slowly poison the battery.
Battery drain will kill them fast too.
If sometimes drains and sometimes doesn't then might be how close to RF interference it is parked. In my case it was a wireless weather station although there was also something in a car-park in town that did it.