I've left my VHF radio on all night a few times in my 124 and the battery was fine. Two years ago when I lived on campus I left one of the map lights on in my Subaru for two days, might actually have been three. Started right up, in the middle of winter no less. Really surprised me considering the battery in it is tiny compared to the battery in the 124.

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Dale

http://i52.photobucket.com/albums/g1...MG_2277sig.jpg

1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

Pre-glow - A moment of silence in honor of Rudolph Diesel