I have a SL550, and previously had an 05 SL500, and never had to trickle charge the battery, even after it going unused for 2 or more weeks. If the battery is in good condition (the battery in my SL500 was 4 years old when the car got wrecked), you shouldn't have to go to those extremes. If the battery looses enough charge over a 2 week period that the consumers don't come on line, then there's something wrong with it, or it's worn out, or you have something draining it.
Did you make any modifications to the MOST system? Replaced or added some devices? If that is the case, it's possible that your MOST system is not going to sleep properly, draining your battery. A short, or a lamp that's always on could do the same thing.
Bottom line, under normal circumstances, you shouldn't have to do any of those things with your consumer battery.
As a followup, I installed the new latch assy and tested the system. Latch performs as expected and the draw down feature was restored. The problem was I still got a trunk open warning. I removed the latch and verified that the latch position switch continuity for both the open and closed positions were working. I jumpered pin 1 and 3 on the harness to verify the input to the logic circuit worked. Every time I re-installed the latch it would give the trunk open warning. Problem was the new latch came without the plastic socket end for the mechanical release rod. Even though I measured the old rod length before installing the end on the new latch the mechanical release would push back just enough to trigger the microswitch in the latch release. After much fiddling with the length on the release rod I finally hit the sweet spot.
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