Calendar Degradation of Batteries

I'm having a problem when I simulate battery considering  “Calendar Degradation: Enter Custom” (and all type of batteries). When I use a Wheather File with a time-step of 60min everything works perfectly, but when I use a lower time step, for instance of 30min, battery lifetime becomes half than what it should be. For a time-step of 15min, lifetime is a quarter of the lifetime with a time-step of 60min. 
There is a similar problem with the option “Lithium-ion model” for Li batteries. In this case, when the time-step is 15min, battery lifetime makes no sense since every year the battery is replaced.

Thank you for your answer, Paul. But I still have a problem when I use the option Calendar Degradation: Lithium ion model. In this case, when the weather file has a time-step of 15min, battery lifetime makes no sense since every 3 cycles the battery is replaced. But , again, it works well when I use a weather file with a time step of 60 min. Thank you again.