I would think that battery was removed from a vehicle because it's shot (it's used, discoloration by neg terminal).

You only measured it's surface charge, a load test will verify the condition (and if you purchased a good unit or core exchange).

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!