yep... you have a bad battery... either dirty/corroded connections, old battery not holding a charge, or weak alternator not charging the battery properly....
1. remove, clean and reconnect the battery post connections ... use some boiling water and a wire brush
2. charge the battery ... or get a boost from another car ... and start the engine
3. check your alternator output ... should be about 14 volts with engine at 1500-2000 rpm
... forty-three years of driving before I get behind the wheel of a BMW .... and I am thinking, "why did it take me so long?"
... and then after another 4 years I can't believe that I have two of them !!
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