[oshusttoley]

so i have an 08 e90. every couple days my when i start my car i get "increased battery dischange" shows up on my nav screen. does this mean i need a new battery soon? also the clock resets everytime and its getting annoying lol. If i do need a new a battery, what one do i need from like advanced auto or pepboys? i rather not spend 500 at bmw.... also i heard i need to register the new battery...how do i go about doing this? sorry if this has been posted before but i really dont know a lot about this kind of stuff. i just drive my car lol. i dont know a lot of technical stuff about it.