BenzWorld Junior Member
Date registered: Jun 2018
Vehicle: 2013 SL550
Location: On and off Cape Cod
Mentioned: 0 Post(s)
Quoted: 13 Post(s)
I bought the M-B branded charger at the dealer last year. I didn't want any excuses as the car was still under CPO warranty should something go wrong with an off brand charger. I was surprised how little help and knowledge there was at the dealership for a 2013 car in regards to battery and charging location. The charger came with clamps and 12V plug. Using that plug in the trunk 12V socket would have been convenient (and more evident that it was plugged in when opening the garage door) but the charger instructions only mention being able to use that on an SUV and SLR. Not quite an SLR. :-) And the owners manual said only use the jump points under the hood for charging. So that is what I did.
In terms of "quick disconnect" I use the supplied end with the clamps and run the negative clamp wire over the egine compartment seal (since it is on the other side of the seal from the positive connection) and then negative and postive paired wire through a space in the seal near the wipers so it the other end with the connector comes out at the base of the windshield under the rear edge of the hood. That way I can disconnect it there and tuck the end of the wire down out of the way of the wipers or anything. The supplied ends are not long enough to go much further - like to the front of the car - with this charger.
The only thing I have to be careful of is to remember when it is plugged in. As it is on the left side (passenger side for me) and not obvious when I go into the garage to get the car and would be easy to miss. I should rig something to remind me that is plugged in so I don't accidently back it out of the garage ripping things apart as I go.
I put the car on the charger because I don't have appropriate tires for New England winter. (Cost) And the owner's mannual warned about driving with the 19" summer run flats at any temperature under 45°F for loss of traction or even cracked tires! So I didn't take it out for long stretches of time even when there was no snow on the roads - hence the charger. Now I need new tires anyway. :-(
One thing does worry me a little is that with the M-B charger it goes through the stages after connecting where it shows a flat, mid, high, and fully charged indicators. Even after driving the car for period when you would expect that it would fully charge the batteries when I hook up the charger it seems to spend a lot of time on the mid level and high level before showing fully charged and being maintained. I don't know the age of the batteries or if this is normal or if I should have the batteries tested during the next service.