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  1. #1
    Join Date
    Jun 2015
    Location
    Jersey
    Posts
    885

    Default Significant battery drain

    Is there any significant battery drain while the engine is switched off and in park. My 451 had a little immobilizer led that flashed every couple of seconds but this wasnít a significant drain.

    I canít see anything flashing in my new 453 and the light on the gear lever showing park switches off after a minute or so.
    2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
    R-Link Evolution Sat Nav/DAB with Android Auto, Bluetooth, USB, SD, AUX
    Heated Seats, Electric Mirrors, Air Con
    6-Speed Dual Clutch Automatic
    Rear Parking Sensors
    White with 15Ē Alloys

  2. #2
    Join Date
    Jan 2019
    Location
    Cambridge (ish)
    Posts
    274

    Default Re: Significant battery drain

    Presumably it has been both measured for loss & calculated into the grand scheme of things by Smart / Merc so try asking for some data on it when asking for the bulbs specifications & whether it is led or old school filament, ...preferably by twitter to Merc uk, or similar so your local garage doesn't start to avoid you (happened to a BMW loving car nut mate of mine) for asking pertinent but seemingly pointless questions in a busy service centre that hit the wall of regular thinking in that environment.

    OR ask the evilution site owner with the 453, as presumably that will be on his "to-do" list for a response with better understanding of your concern, & delivery in reply.
    Smart (450 city coupe 0.7 pulse) 2003 "vintage" 45KW / 61 HP (M160/1)
    450 0.7 Brabus "Red A" 55.2KW / 74 HP
    E.V. Owner (Nissan leaf)
    E-Biker
    17 snowboards (ish)
    Bitter drinker (not bitter)
    Cheapskate, Skateboarder,
    Old enough to know better.

  3. #3
    Join Date
    Dec 2016
    Location
    Hampshire
    Posts
    378

    Default Re: Significant battery drain

    Quote Originally Posted by nlel View Post
    Is there any significant battery drain while the engine is switched off and in park.
    What are you actually concerned about? As long as you turn the lights off and lock it then you should be able to leave it a couple of weeks without any problem. Ours has been left for longish periods, though possibly not a whole two weeks, with no difficulty starting again.

    Locking may be important as it tells the car it can go to sleep properly. I notice ours leaves the display on for sometime if not locked (I've not timed it out as it's usually just while unloading shopping or suchlike).
    2016, ForTwo cabriolet, 900 turbo, DCT, Prime Premium, unmodified.

  4. #4
    Join Date
    Jun 2015
    Location
    Jersey
    Posts
    885

    Default Re: Significant battery drain

    Went out in car this morning and it started after being left for a week, of course it would. Turned off stop start and drove 23 miles non stop, that will have given the battery a good charge.
    2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
    R-Link Evolution Sat Nav/DAB with Android Auto, Bluetooth, USB, SD, AUX
    Heated Seats, Electric Mirrors, Air Con
    6-Speed Dual Clutch Automatic
    Rear Parking Sensors
    White with 15Ē Alloys

  5. #5
    Join Date
    Dec 2016
    Location
    Hampshire
    Posts
    378

    Default Re: Significant battery drain

    Ours goes out probably three times a week, average journey maybe 5 miles, with a stop. Longest regular drive is probably 16 miles return, with stop, about once a fortnight. Never had a problem (yet).
    Don't worry about it. Unless you have to crank it for 20 seconds to start it the alternator will put that power back in a couple of minutes.
    E.g. Crank 300A for 3 seconds = 900As. Alternator at 30A, 900/30 = 30 seconds. Add a bit on for discharge while not used and reduce charge rate because (eg) headlights on, etc, and the battery should still be well up within a mile or two.
    2016, ForTwo cabriolet, 900 turbo, DCT, Prime Premium, unmodified.

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