1971 240Z - won't start - help!

[KDMatt]

Just a hint here. Even a new battery will fail if allowed to discharge and left this way. When the battery discharges and if not recharged soon it will not be able to recharge back to it's capacity when you do recharge it. There is an explanation for this I won't go into here. If this happens a few times the storage capacity will be greatly diminished. If when you do let the car sit idle for the winter. If you put a charger on it once a month this will keep the battery charged and fresh. Just as long as you don't have a short or relay drain as was previously mentioned . I had the relay situation on my Z as well from a after market dis-abler I installed. If this is the case simply disconnect the ground connection on the battery. If the car is stored in a unheated garage in cold country , I recommend removing it and store the battery in an area that will not freeze, still charge at the monthly interval. I have done this with my boat, trailer batteries for years, with great results. I have has ''trickle'' chargers over charge and ruin batteries. Gary

My battery has been almost completely discharged twice and I've never had this problem.

In fact, one time it went completely dead :dead: over the winter and I had to clip on an overnight charger in the spring... and I haven't noticed any diminished capacity...

In fact, just this last winter, I let the car sit idle for just as long, and the battery still had a 12 volt charge when I went out there in the spring to fire her up! (no charging, no jumps, nothing) So if anything, my battery's doing better now than it was before.

Only thing I noticed is that the clock had gotten five minutes behind during that time... yes, the clock in my Z still tells time, and it's accurate!