Join Date: Mar 2015
Location: Pittsburgh, USA
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No. If the 12 volt battery goes flat for an extended time, the traction battery totally discharges itself (by a mechanism that we still dont have details about) and is ruined. And a ruined traction battery pretty much totals the car.
I can't imagine that they would honor your BAP warranty when you are only starting payment after the traction battery is ruined.
There are stories of intrepid DIYers resurrecting the traction battery by taking the battery out, opening up the case, and charging it cell-by-cell (or groups of cells) with a benchtop DC power supply starting with an extremely slow charging current (10 milliamps or so). They then face a challenge getting the system re-enabled. It can presumably only be done with the proprietary MB Star syatem.
Why would ANYONE buy a car, sight unseen, that they know does not run?