But seriously, after getting ofer the sudden feeling of being rich, I found the exact same thing you did. Giant white battery, about 1/2 full. Planning to get some distilled water and fill it up - I don't see any way that it could hurt.

Steve, the only battery I know of that can stand being upside down for 15 minutes is an Optima. I have one in my Jeep Commanche and it is fantastic. I plan to transfer it to the E300 when this battery dies. Actually, I'm surprised that the MB battery has lasted this long. The heat in Florida usually kills them after a couple years. Maybe the location has helped to preserve it.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References