Take both battery terminals off and give the posts and terminals a good clean. Make sure that the terminals are really tight, check that they can't rotate.
I have had problems both with the Z3 and a few E46's in the past.
BMW use a 10mm bolt that tightens the terminals from the bottom which is not a good system as it doesn't seem to tighten the terminals enough.
You think the battery is dead and recharge it but it turns out that disturbing the terminals brings it back to life.
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