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My car's start-stop won't work because of a partly discharged battery - would a trickle charger solve the issue?

My 18 month old Mercedes-Benz E-Class won't automatically stop-start anymore due to a partly discharged battery. It's left in my garage for weeks at a time, so it's understandable. I took it for a 120-mile drive, but the battery is still reported as partly discharged. Is there a trickle charger you recommend, and are they safe to leave connected whilst I'm away?

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If the car is only 18 months old then I'd go back to the dealership.The most likely problem is the auxiliary battery. See the attached link:

You could use any trickle charger, so it's really is a case of how much you want to spend. If you get a good quality one then it should be okay to leave it connected.
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