Normally my Z4 stays in the garage until the weekend. Then I started
driving it every day to the P.O. and back (10 mrt). Then one day it didn't
start. I took the battery to the parts store and they checked it out for
an hour. It was O.K. Then I contacted the BWM shop and took it in. Again
it checked out O.K. The mechanic asked about my driving habits. He said I
had a bad driving profile. The battery would be drained a little during
non-use and more upon start-up. I was not driving far enough to charge it
back up. He said he has had this discussion with people who buy a new 7
Series and come back a month or two later complaining about a dead battery.
Anyway, I bought a trickle charger for $70. I connect it and it "tops
off" the battery every 2-3 days.
Never mind the battery - it kills an engine never getting to full working
temperature. Which it won't in five minutes regardless of what the temp
I have a charger bought from Lidl for 12 GBP. Charges the battery then
switches to a maintenance charge which can be left on indefinitely. Small
enough to just about fit in the pocket, but powerful enough to charge a
flat battery overnight. Very handy for my other car which doesn't get as
much use as my BMW.
*Money isn't everything, but it sure keeps the kids in touch.
Dave Plowman email@example.com London SW
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