Went out to start ole' Betsy, 520i, this morning, and it wouldn't start. It chugged for about 1-2 seconds but then died. You can hear it firing occasionally when I crank it now, but it won't continue. I got 6-7 tries before the battery started getting noticably weaker. I went out a little while ago and only got about 3 tries before it started cranking slower, so the battery is obviously weak. Would the weak battery, though, be the cause of the original problem, i.e car not starting? The motor would crank, but not fire consistently. Just trying to eliminate the easy stuff first.