Battery upsize

1971-1989: 280SL, 280SLC, 300SL, 350SL, 350SLC, 380SL, 380SLC, 420SL, 450SL, 450SLC, 450SLC 5.0, 500SL, 500SLC, 560SL
Post Reply
Djenka018
250s
Posts: 259
Joined: Sun 06 Aug, 2006 12:50 am
Model you own: w107
Region: New South Wales
Location: Syd Vicious

Battery upsize

Post by Djenka018 » Fri 19 Oct, 2018 9:45 pm

Hello ladies/gentlemen,

trying to get a new battery and I'd like to fit the largest it will fit in the RHD design for iron block series (batt in the engine bay on the LHS)

Currently the car has 65Ah/550CCA in size W x H x L 175x175x278
These have now gone up to 72Ah/680CCA

If I go 315mm length I can get 80Ah/730CCA
If I go 190mm height in addition to above it goes to 90Ah/912CCA

Both up-sizes appear as possible...

Has anyone ever gone upsize ?
'80 450SLC 3-continental

User avatar
Tony From West Oz
OZBENZ moderator
Posts: 3242
Joined: Mon 20 Jun, 2005 9:04 pm
Model you own: w202
Location: Bedfordale WA

Re: Battery upsize

Post by Tony From West Oz » Fri 19 Oct, 2018 10:45 pm

The W107 model came with a Din66 (Aus delivery) or Din88 battery (USA or China delivery).
If the battery tray is larger than the physical battery size then it will fit. Just make sure that you get the DIN battery, not just any battery that will fit.
Watch for bonnet interference with battery terminals (Not likely with DIN batteries as they have the terminals in a cutout and the terminals do not protrude above the height of the battery case).
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (SOLD)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

Djenka018
250s
Posts: 259
Joined: Sun 06 Aug, 2006 12:50 am
Model you own: w107
Region: New South Wales
Location: Syd Vicious

Re: Battery upsize

Post by Djenka018 » Tue 12 Feb, 2019 7:23 pm

Just to follow up,
i went for AC Delco 72Ah/680CCA and I am sure the next size up (315mm long) will not fit in the engine bay battery tray.
It cranks exceptionally well but I always had semi good batteries removed from daily driver so not a proper reference.

there are variations with about 305mm with different height (195ish) but the upgrade benefit does not justify the risk
'80 450SLC 3-continental

jbp
C Class
Posts: 31
Joined: Tue 21 Apr, 2009 9:28 am
Model you own: w107
Location: Sydney

Re: Battery upsize

Post by jbp » Tue 12 Feb, 2019 7:51 pm

Interestingly I am just going through the same thing, as the current battery in my 450 SLC seems to have dropped a cell.
I currently have DIN 66 - 63 Amp Hour - 610 CCA battery.
I measured it at apx 275 L x 175 W x 172 H mm.
I am looking at possible replacement battery sizes and noted that whilst the battery tray was unlikely to take anything wider, it would take a bettery about 25 mm longer.
I wasn't keen to increase the height given how close the top will be to the bonnet.
I am thinking I will replace it with another DIN 66 battery.

jbp
C Class
Posts: 31
Joined: Tue 21 Apr, 2009 9:28 am
Model you own: w107
Location: Sydney

Re: Battery upsize

Post by jbp » Tue 12 Feb, 2019 8:48 pm

Hi Djenka
I have had another look at the clearance from the top of my current DIN 66 battery to the underside of the bonnet and suspect it may comfortably accommodate the next size up DIN battery, which is 190 mm high. An extra 18 mm.
I looked up AC Delco catalogue and the specifications of the DIN 72 S57220 AC Delco battery at 72AH 120 680CCA 278 X 175 X 190 H mm.
Is this the battery you fitted to your 450SLC?

Djenka018
250s
Posts: 259
Joined: Sun 06 Aug, 2006 12:50 am
Model you own: w107
Region: New South Wales
Location: Syd Vicious

Re: Battery upsize

Post by Djenka018 » Tue 12 Feb, 2019 10:39 pm

I believe that is exact battery I got, I will confirm tomorrow
It was the most of the CCA and Ah for the size.

I may be able to save you a few bucks if you want the same type...
'80 450SLC 3-continental

jbp
C Class
Posts: 31
Joined: Tue 21 Apr, 2009 9:28 am
Model you own: w107
Location: Sydney

Re: Battery upsize

Post by jbp » Wed 13 Feb, 2019 8:01 pm

Thanks Djenka
I will be interested to hear what you did buy.
I put a timber packer on top of the battery as a spacer and it seems as if it is below the underside of the bonnet insulation so I think the 190 mm height will work.
Cheers.

Djenka018
250s
Posts: 259
Joined: Sun 06 Aug, 2006 12:50 am
Model you own: w107
Region: New South Wales
Location: Syd Vicious

Re: Battery upsize

Post by Djenka018 » Mon 18 Feb, 2019 11:12 am

the batt I fitted was S57210 ACDelco SMF 72Ah, 120min reserve, 630CCA, LHW 278mm 175mm 175mm

fits perfectly and I think a longer batt will have issues at the firewall side (the tray is longer and vacuum stuff prevents full use of the tray)

not the 680CCA as I said... I'm getting old.
I did contemplate S57220 hence the confusion but the benefit was only 8% more CCA and nothing else and if it did not fit I'd end up with the batt I have no use elsewhere

Other alternatives were a bit risky for the benefits (in terms of fitment).
'80 450SLC 3-continental

jbp
C Class
Posts: 31
Joined: Tue 21 Apr, 2009 9:28 am
Model you own: w107
Location: Sydney

Re: Battery upsize

Post by jbp » Tue 19 Feb, 2019 8:21 am

Hi Djenka
I went with a Lion 457T DIN66T 710 CCA 140 min battery.
I checked the fit by placing a timber packer on top of the old DIN66 battery and watching as the bonnet was closed.
I installed the new battery and the increased performance was immediately noticeable as the car started with almost no noticeable cranking.

One thing I neglected to check, and gave me pause for concern after I had dropped the new battery in, was the connection of the battery cables. The positive wasn’t really a problem, as I just had to reposition the cable to get it to reach the 18 mm higher battery post. However the negative cable was at struggle as it needed to be straightened to get it to reach over the higher negative battery post. Next time I have the battery out I will look to straighten the negative cable a bit more. Given the cable goes from battery negative to firewall there is no relative movement when the car is running so straightening the cable a little should not be an issue.

I had pulled the battery tray to clean and pant it and decided to fit the battery clamp to it before I reinstalled it in the car. I trial fitted the new battery to the tray with clamp installed before I installed the tray in the car so I knew that in theory it could be fitted with the clamp in place rather than my usual practice of removing nuts, washers and clamp before removing the battery. It was fiddle but I was able to install the new battery in the tray with the clamp installed. This means washers and the 10mm nuts don’t get dropped when trying to fit them on the clamp once the battery is in.
You do not have the required permissions to view the files attached to this post.

Post Reply

Return to “W107 Coupe and Roadster models”