Author Topic: Correct Battery Size for W111 3.5  (Read 412 times)

JPMOSE

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Correct Battery Size for W111 3.5
« on: February 21, 2020, 20:16:45 »
Hello… I am trying to find the correct battery size for my car. I suspect the one that’s in there is a little small based on the tray. The current one is 13 inches length, yet, it appears that it could fit a 15 inch length. I’ve done several searches and come up with different sizes so I’m befuddled. It should be noted that the interstate battery in my car is 14 years old and still working! However, I don’t want to press my luck!!! I feel like I’m holding the worlds record! LOL
Best Regards,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabriolet
1987 560SL

wwheeler

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Re: Correct Battery Size for W111 3.5
« Reply #1 on: February 21, 2020, 21:04:45 »
Below is a battery size list if you haven't already seen one. They are not always exact, but should get you pretty close.

https://www.batteryequivalents.com/bci-battery-group-size-chart.html

And then you also need to pay attention to the location of the positive and negative terminal. I hope that helps some and good luck.
Wallace
Texas
'68 280SE W111 coupe
'60 220SE W128 coupe
'70 Plymouth Roadrunner 440+6

JPMOSE

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Re: Correct Battery Size for W111 3.5
« Reply #2 on: February 21, 2020, 21:40:42 »
Thank you sir!!
Best Regards,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabriolet
1987 560SL

JPMOSE

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Re: Correct Battery Size for W111 3.5
« Reply #3 on: February 23, 2020, 14:26:27 »
For the record, Group 49 or H8 is the correct one for the V8 engine.  I have to admit it was hard to turn in my Interstate battery that was 14 years old!  Batteries Plus was shocked when they tested it and still held a full charge!  I went with a Duracell Ultra because it was all black, which I felt appeared better than some bright colored unit (which unfortunately the Interstate was).  I’ve had a Duracell in my 250SL and it has performed well ( now at 5 years).
Best Regards,

J. P. Mose
1968 250SL
1970 280SE 3.5 Cabriolet
1987 560SL

wwheeler

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Re: Correct Battery Size for W111 3.5
« Reply #4 on: February 23, 2020, 21:56:51 »
Good to hear! I would like to use Interstate as well, but I agree their coloring is too much for me. I used a Bosch from Pep Boys and it is perfectly plain and black.
Wallace
Texas
'68 280SE W111 coupe
'60 220SE W128 coupe
'70 Plymouth Roadrunner 440+6