Swapping to group 47 battery

[FirstGT]

Looks like it's nearing time for a battery replacement.

I did some searching on google and here and looks like a couple people swapped to group 47 batteries. Both of the people I saw mention it went with XS power but I don't wanna drop that kinda coin on a battery.

I was thinking of going with Duracell AGM size 47

I looked at the battery tray this morning and the OEM looks pretty damn tight as is and I think these 47s are a little bit bigger, so with that said, what is required if anything to swap in a size 47 battery?

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[CrashOverride]

Looks like it's nearing time for a battery replacement.

I did some searching on google and here and looks like a couple people swapped to group 47 batteries. Both of the people I saw mention it went with XS power but I don't wanna drop that kinda coin on a battery.

I was thinking of going with Duracell AGM size 47

I looked at the battery tray this morning and the OEM looks pretty damn tight as is and I think these 47s are a little bit bigger, so with that said, what is required if anything to swap in a size 47 battery?

Have you looked into Odyssey? My buddy has one and likes it. I bought a bosch AGM at pep boys for my van and I like it, when mine goes in the Stang, I'll probably replace it with a Bosch.

 

[FirstGT]

no I hadn't but I will when I get home

are you referring to the oem size 96R or size 47 for the above mentioned batteries?

 

[CrashOverride]

no I hadn't but I will when I get home

are you referring to the oem size 96R or size 47 for the above mentioned batteries?

You know, truth be told, I'm not sure. They are great lightweight (Buy quite expensive) batteries though. I found this youtube video where a guy used the Odyssey PC1200MJT battery which seemed to fit fairly well.

Back when I had my SRT-4 (8.0:1 compression), I actually used a $25 lead-acid lawnmower battery to start it. It worked absolutely fine for about 2-3 years and then I'd just replace it. Easily took 20# off the front. I'm not suggesting it for our much higher CR engines (With 2x the cylinder count) though.

 

[solodogg]

I just spent the last week considering this exact same swap, but in the end decided to go with a Duracell (East Penn) 96R instead. As much as i'd rather have an AGM battery in Florida (oh how i'm tired of leaky Johnson Control batteries), there are a few things that need to be considered before making the jump.

https://www.jegs.com/Sizecharts/bcigroup.html

First, the H5/Group 47 battery is slightly taller (5/8"), which is one of the very limited dimensions in the stock battery box. The battery tray has room on the sides to go with a longer battery, but wider/taller are pretty limited. I would say it will fit, but it's going to be even closer to the cover than it already is for sure.

Second, AGM batteries require different charging strategies. Lead acid wet-cell batteries want to be charged to ~2.4V per cell (14.4V total), while AGM batteries typically want to be ~2.3V per cell (13.8V total). Swapping a 96R for an AGM H5 will likely result in slightly overcharging in the Mustang, especially with the Ford Battery Monitoring System that constantly varies the voltage to maintain a battery and enhance fuel economy. I would definitely try to find another Ford vehicle with a H5 battery factory installed, and use FORScan to modify the BCM values that control the BMS charging voltage.

Speaking of BMS...make sure whoever replaces the battery has the capability of resetting this system. I've heard that leaving the car sit with a fully charged battery for 8 hours will allow it to adjust the charging strategy, but this doesn't reset the time based charging strategy. Without performing the reset, your car will still think you have an aged battery installed, and may use higher voltages than it normally would in attempt to keep the battery alive.

Hopefully this helps

 

[FirstGT]

I just spent the last week considering this exact same swap, but in the end decided to go with a Duracell (East Penn) 96R instead. As much as i'd rather have an AGM battery in Florida (oh how i'm tired of leaky Johnson Control batteries), there are a few things that need to be considered before making the jump.

https://www.jegs.com/Sizecharts/bcigroup.html

First, the H5/Group 47 battery is slightly taller (5/8"), which is one of the very limited dimensions in the stock battery box. The battery tray has room on the sides to go with a longer battery, but wider/taller are pretty limited. I would say it will fit, but it's going to be even closer to the cover than it already is for sure.

Second, AGM batteries require different charging strategies. Lead acid wet-cell batteries want to be charged to ~2.4V per cell (14.4V total), while AGM batteries typically want to be ~2.3V per cell (13.8V total). Swapping a 96R for an AGM H5 will likely result in slightly overcharging in the Mustang, especially with the Ford Battery Monitoring System that constantly varies the voltage to maintain a battery and enhance fuel economy. I would definitely try to find another Ford vehicle with a H5 battery factory installed, and use FORScan to modify the BCM values that control the BMS charging voltage.

Speaking of BMS...make sure whoever replaces the battery has the capability of resetting this system. I've heard that leaving the car sit with a fully charged battery for 8 hours will allow it to adjust the charging strategy, but this doesn't reset the time based charging strategy. Without performing the reset, your car will still think you have an aged battery installed, and may use higher voltages than it normally would in attempt to keep the battery alive.

Hopefully this helps

height seems to be a factor but I would think it would be ok to leave the cover off? I feel like most, if not all, my trucks over the years had batteries open to the elements under the hood?

 

[FirstGT]

You know, truth be told, I'm not sure. They are great lightweight (Buy quite expensive) batteries though. I found this youtube video where a guy used the Odyssey PC1200MJT battery which seemed to fit fairly well.

Back when I had my SRT-4 (8.0:1 compression), I actually used a $25 lead-acid lawnmower battery to start it. It worked absolutely fine for about 2-3 years and then I'd just replace it. Easily took 20# off the front. I'm not suggesting it for our much higher CR engines (With 2x the cylinder count) though.

good find on the video. that little adapter or whatever you wanna call it at the end of the vid he says doesn't fit anymore is what I was worried about. But I'd imagine you could just kinda put anything of decent density in it's place to "lock" the battery in? Like cut a piece of high density foam or something and drop it in the gap...

 

[CrashOverride]

I haven't looked at the factory mount, but usually they are pretty simple devices. You might be able to buy a universal one at an auto parts store, and modify it. Otherwise, yeah you could probably get yourself a chunk of plastic or hard rubber (Hockey puck?) and fabricate one fairly easy since plastic can be cut/shaved/drilled without any special tools.

 

[solodogg]

height seems to be a factor but I would think it would be ok to leave the cover off? I feel like most, if not all, my trucks over the years had batteries open to the elements under the hood?

Heat kills batteries, anything that helps reduce their temperatures is good in my book. My car is a 2015 and on its third battery already because of Florida...

 

[Antigravity Batteries]

HI all,

I was just about to post about this exact issue regarding Battery Dimensions and fitment in the Mustangs and specifically the GT350s. So this is great to find this post.

We are a new site sponsor and sell lightweight Lithium-Ion Batteries... I'll give you an example below. We just came our with our Automotive OEM sized lithium Batteries....

So here's my questions. Can anybody confirm if the H5/Group47 battery will fit into the existing GT350 battery tray and fit with the cover? As explained above by the H5/Group47 battery is 5/8th inch taller than the 67R battery. But we also know that the 67R is the same physical size as the 96R which is also know as the T5 (in Euro terms). So while the 67R=96R=T5 in terms of sizes.... they are all actually 5/8" inch lower than the H5 battery, but the exact same in Length and Width. So height is the only concern.

So with that being said.... can anybody confirm absolutely that they can fit the battery cover over the H5/Group47 if they have done this change? And was there any issues?

Any assistance would be appreciated. We really want to confirm this as our new battery comes in sometime next week.

Also for those interested.... Here is what our Lithium Batteries are about...

Below is the new battery and here is the link to read about it.

https://shop.antigravitybatteries.com/products/starter-batteries/automotive/ag-h5-rs/

So this new line of RE-START Batteries is a dedicated Automotive Batteries, not like some other smaller Lithium Batteries that some use. They are available in the most popular OEM Automotive Battery Sizes to fit most any Performance, or Passenger Vehicles on the Road. Additionally they have our RE-START built in Jump Starting that can Wirelessly activated.... so in essence you would never be stranded with a dead battery... no matter where you are and if the battery drains you just press the provided Keyfob to access the built-in jump starting and start the car.

Another Cool Feature is that we are making them in different Amp Hour Capacities. Most of these new batteries will have a 24Ah, 30Ah or 40Ah option. So you can choose what works best for your application. For example if your into the biggest weight reduction then our 24Ah in the H5/Group47 size weighs 8.5lbs.... on the other hand if you want something with alot of extra capacity you can opt for the 40Ah version which weighs 15lbs.. but is better for a Car driven in freezing weather, and where you have alot of extra accesories. We have a 30Ah model also that splits the difference but those are about another month or so later as they are still in production.

Below are some pictures...

 

[wildcatgoal]

Honestly, why replace with anything else (and spend AGM money) if you aren't going to replace with a lighter battery? The factory battery is fine for 99% of people... just get another one.

The big question is, a more "standard" battery could have easily been fitted into these Mustangs, but instead Ford decided to use a 96R which cannot be found anywhere. Why is that? Oh, right... see my second sentence.

As for AGM, I have put AGM batteries in every single one of my cars prior to the Mustang (because I used to put in fancy car stereos) and never had a charging problem... ever. Even with factory sense charging. I used to use Die Hard Platinum (which are re-badged/skinned Odessey batteries) but naturally Sears can't handle themselves and dropped that line, despite them being sold out ALL THE BLOODY TIME.

 

[wildcatgoal]

As for the Antigravity batteries noted above, $600+ for a battery.... yikes. I get the tech, but yiiiiikes.

Those make perfect sense in a race car, for sure. Or for people who have enough money to buy all natural toothpaste in auto-dispensing silver-embroidered biodegradable containers.

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