Rep Power: 0

if u never started your car and gave the alternator a chance to kick in how long would the battery last

 
Rep Power: 305

If the car is parked inside a garage, get a battery tender, it will trickle charge (then shut off when fully charged).

Othewise, disconnect the negative terminal, and usually it will be fine for a couple of months. From my experience with my boats and jet skis, 3 months was usually okay if they were fully charged, but I bought the tenders to make the batteries last.

 
Rep Power: 0

kinda depends on how old the battery is, but like rickinthescv said, a few months if its disconected

not going to be driving your car for a while?

 
Rep Power: 309

do you mean this as in, how long would it last if i left a dome light on at night or if i started the car and the alternator didnt kick in or if i garaged the car or if you just sat in it with the radio blairing outside

 
Rep Power: 309

there are batterys you can buy that come without electrolytes in them so then once your ready to drive it you just poor them in and your ready to go.