Thank you so much for the detailed answer!
Well last night it did reach light #3 after about 9-10 hours charge (crocodile clips directly attached to battery's positive and negative - XS 0.8 manual & FAQ says it is smart enough so I trust it).
I'll see how long it takes to reach light #5.
Will charge the M2 over the weekend after some driving ;-)
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2016 F87 M2 DCT LBB
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