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Hello all,
I've changed battery on all of my previous cars, and this 991.2 is the only one w/ battery in the center, instead of towards left/right side of car.
Since the battery is heavy, what's the best way to replace it w/o hurting my back?
Is it safe to step into the frunk, to get closer to the battery? (how heavy can you put stuff in there BTW?)
Or is this really a two-person job (each person grabbing one handle, to pull out old battery & put in new together)?
Lastly, would I be able to replace battery w/o losing the radio or other electronic settings? (does this car have a smaller auxiliary battery?)
If so, within how much time do I need to complete the replacement?
When I replaced battery on a MB W212 E-class within 15 minutes, I didn't lose any settings.
I stand inside the frunk, and place an old bar stool right on the front of the bumper. Lift the battery, place it on the stool, climb out and lower it to the ground. Reverse the steps for installation.
I use a towel between the battery handles to lift the battery into the frunk (easier on the hands and makes lifting a little easier). I then put one foot in the frunk, the other outside on the floor. Lift the battery with the towel.
No memory loss to your presets. The only thing you may have to do is reset your windows. Some people have to, others do not, for whatever reason.
I noticed there are two really small cables connected to the positive & negative ends (see photo).
They're coiled up in a spool next to the battery.
Anyone know what they are, and their purpose?
I noticed there are two really small cables connected to the positive & negative ends (see photo).
They're coiled up in a spool next to the battery.
Anyone know what they are, and their purpose?
Looks as if a previous owner is powering something not original to the car.
To add...I just did this. I noticed even after a drive my 5+ year old battery was not showing good voltage. Some tips when doing yourself. I basically went to a Car Quest and swapped in the new battery in the parking lot. It's super easy if you prep.
At home:
1. Remove the thin black metal retaining bar that goes across the top of the battery. When doing this place a rag under the bolt to the firewall in between the battery and firewall. This will help you not lose the bolt into no-mans-land if you drop it during removal.
2. To remove the retaining bar lower bolt you have to remove the torx (15) screws holding the horn and Air Pump Box. I removed the box, re-attached the air horn for driving to Car Quest.
3. Pack your tools to be able to remove the terminals and remove/reinstall the battery. The battery is held in place by one bolt at the bottom which secures a metal clamp.
At the Shop (Car Quest or other):
1. Remove the bolt and clamp securing the battery.
2. Remove the Positive Terminal first. Then remove the negative terminal. Be care ful to avoid the terminals touching metal of the body regardless.
3. Lift out by standing in the Frunk as others have stated.
4. Exchange the core for the new battery and reinstall the bolt and clamp.
5. Reinstall the Negative Terminal First and then the Positive Terminal.
At Home:
1. Reinstall the retaining bar and air compressor box.
I had zero issues with loss of power during the swap. Everything works as before.
To add...I just did this. I noticed even after a drive my 5+ year old battery was not showing good voltage. Some tips when doing yourself. I basically went to a Car Quest and swapped in the new battery in the parking lot. It's super easy if you prep.
At home:
1. Remove the thin black metal retaining bar that goes across the top of the battery. When doing this place a rag under the bolt to the firewall in between the battery and firewall. This will help you not lose the bolt into no-mans-land if you drop it during removal.
2. To remove the retaining bar lower bolt you have to remove the torx (15) screws holding the horn and Air Pump Box. I removed the box, re-attached the air horn for driving to Car Quest.
3. Pack your tools to be able to remove the terminals and remove/reinstall the battery. The battery is held in place by one bolt at the bottom which secures a metal clamp.
At the Shop (Car Quest or other):
1. Remove the bolt and clamp securing the battery.
2. Remove the Positive Terminal first. Then remove the negative terminal. Be care ful to avoid the terminals touching metal of the body regardless.
3. Lift out by standing in the Frunk as others have stated.
4. Exchange the core for the new battery and reinstall the bolt and clamp.
5. Reinstall the Negative Terminal First and then the Positive Terminal.
At Home:
1. Reinstall the retaining bar and air compressor box.
I had zero issues with loss of power during the swap. Everything works as before.
Actually, battery removal is the opposite of what you said. When removing, remove negative terminal first, then the positive. When re-attaching, do the opposite. Positive first and then negative. Removing negative first takes away the possibility of sparking.
Actually, battery removal is the opposite of what you said. When removing, remove negative terminal first, then the positive. When re-attaching, do the opposite. Positive first and then negative. Removing negative first takes away the possibility of sparking.
Exactly...this way you do not end up being a welder.
I stand inside the frunk, and place an old bar stool right on the front of the bumper. Lift the battery, place it on the stool, climb out and lower it to the ground. Reverse the steps for installation.
Thank you everyone for your responses.
I was able to replace the battery within about 20 minutes, and didn't need to reset any electronics.
My initial concern was hurting my back while lifting the old & new batteries in & out of the bay, due to its location.
GoTexas' tip above was a great help - his method worked wonderfully for me, and I highly recommend it, especially if you're doing this alone.
This video also helped (but ignore the part where they removed the positive terminal first; see comments above for reason):
11-24-2023, 03:43 PM
Best way to change starter battery by yourself?
Use a bar stool
