new 12V battery dead after 12 months

[sc.teach]

Long story short, my 2014 EV was in the shop for months due to lack of availability of the the onboard ev battery charger. Finally replaced it in 09/2023, along with the 12V battery.

The 12V battery just died yesterday, about one year after it was replaced.

Is there something I should be aware of that could have caused the 12V battery to die so quickly?? I am mainly concerned that there's something else potentially wrong with the car.

Thanks!

 

[alflash]

Was the 12V battery terminals disconnected while waiting?