C350 battery keeps going flat

Clare

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My C350 AMG Sports is about 4 1/2 years old. I don't use the car very much as I am now retired, but the battery keeps going flat. I have previously had 5 Mercedes cars and never a battery has let me down, but this car seems to have a problem, the dealership told me to use the car more often but I don't need to.
Last year 2 months after the warranty finished, the battery had to be replaced, it cost £100, I did have extended warranty, but I had an excess, which I don't have this year.
So I have asked my local Mercedes Main Dealership at Chichester, to put the car on a diagnostic test, to see if something is pulling the battery down. I even bought a new CTEK smart battery charger, which handles AMG batteries, I had it on charge only 10 days ago but today it was flat.
Can anyone advise me, am I asking too much to expect a battery to last 2 weeks, with a good charge, or what should I ask for?.
 

DREAMER NO2

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W124 2.6E M103 1989
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Clare, snap, new battery on my 260e .Not useing it due to work i am doing on the car.Fully charged last week .Put the key in to day ,not a click.I had a bmw before and that was just the same .You see it as a flashing imobiliser light running all the time ,and also one inside the radio flashing also.Not long draining out your amps. I will take the earth lead off when it is charged .Only thing it will take the code from my radio,this i can put in later.
 

robparker

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220d (115), 190d (201), c63 (204), 220ce (124)
Not surprised that the OP's is going flat with infrequent use, but a 260e should easily be able to manage a couple of weeks between runs before a battery starts to go flat
 

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