Dead Battery? Don’t worry; you can bring that battery back to life if you charge it properly. Jump-starting the car is not recommended on a wholly discharged battery unless you have to. Remember that jump-starting will run the car, but you risk damaging the battery. You can damage battery cells or make the battery not hold a charge as it should. A car battery can last 5 to 7 years; your battery should have a sticker with the date it was made on it. If your battery is not over seven years old, don’t give up on it. I just had an 8-year-old Mercedes Benz SLK Class parked for three months, and when I went to start it, there was no power. So here is what I did to get the car started.
First, there are two things you will need to bring a completely dead battery back to life.
1. You need time. At minimum one day, preferred two days.
2. A trickle charger.
A trickle charger will put a very slow charge on the battery and bring it back from the dead. Any of these chargers on Amazon will work; some cost only about $20, which is well worth it. All you need is a 1.5 or 2.0 Amp 12-volt charger. If money is not an issue, you can get a charger and starter simultaneously. They cost a little bit more but allow you to do a 2.0 Amp slow charger, a fast 10amp charge, and a 75 amp or higher setting for jump-starting. Here are a few highly ranked ones on Amazon that work as chargers and starters.
If you try to charge a dead battery by jumping starting the car or putting a current over 10 amps on it you risk damaging the battery. Not even that, but if you have a battery that has terrible cells, it could even explode.
2. b. Or if you want to leave the battery in the car, disconnect the negative terminal from the battery.
3. Connect the red (+)positive cable from the charger to the positive terminal on the battery.
4. Connect the charger’s black (-) negative cable to the battery’s negative post.
5. Plug your charger into an outlet.
6. Let it charge for at least 24 hours. Check the battery in a few hours to ensure it’s not getting too hot.
The SLK battery I charged took two full days to charge, ultimately.
Note: If your battery is older than 7 or 8 years, you should replace it soon. Because there are a lot of electronics consumers in these luxury cars, they tend to be very sensitive to the battery voltage. When the battery doesn’t provide the voltage and current, you may notice strange malfunctions with systems such as the transmission, ECU, and airbag.
If your battery is old or you don’t want to even deal with charging a battery, you can quickly get a new battery on Amazon that will fit your Mercedes Benz. They are brand names; you can get the battery at your front door. Check out these highly-ranked batteries on Amazon that fit Mercedes-Benz cars.
If you have any questions or comments, feel free to comment below.