You don't mention how old the battery is
The slk needs a great battery, not a 'meh' one
The slk needs a great battery, not a 'meh' one
This was definitely not a stupid question - have just checked and the connection to the battery WAS loose! Securely tightened and ALL working again :grin:Probably a really stupid question, but have you checked that the battery are properly secured? I'm picturing that after the drive they came slightly loose.
Otherwise, I'd check the voltage and/or get the battery load tested by a battery centre.
As far as I'm aware it's not TOTALLY out of the realm of possibility that the battery just died. Maybe a cell shorted?