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One other thing to note is that you shouldn't really connect your CTEK charging cable ground ring to the battery itself. The battery has the Intelligent Battery Sensor (IBS) in that black module on the negative terminal. If you connect the charging ground directly to the battery then the IBS won't know when you're charging the battery with the charger as you've bypassed it, so it won't factor that into its calculations on battery state, health, and life. If you move the ring terminal to the chassis somewhere then you'll be fine, as the charging current will have to pass through the chassis ground lead, the IBS, and into the battery.
This is why BMW recommend to charge through the engine bay jump start points.
The positive connection point is fine, as the IBS is only on the negative terminal.
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