What is a Good/Great Light weight battery? - Mustang Evolution

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Old 11-30-2014, 01:25 PM   #1
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What is a Good/Great Light weight battery?

I am wanting to autocross my Cobra. How long did the battery last? How much did it weigh?
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Old 11-30-2014, 01:54 PM   #2
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I don't know of anyone who has used one in our cars. I know that some of the high end sports cars come with them as standard equipment.
It seems that they typically weigh about one third of what a comparable lead-acid battery weighs.
They are very expensive though!
I've thought, many times, about that heavy battery sitting in the front of the car, but I would have to do every other weight saving trick before considering a lithium ion battery.
Depending on what class that you are planning to run your Cobra in, it may be legal for you to move the battery to the trunk. That would be a lot cheaper than replacing it with a lightweight racing battery.
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Old 11-30-2014, 11:14 PM   #3
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I haven't tried one in my mustang yet, but I had a braille 17lb battery in my c5z a couple of yrs back. It lasted a little over 3 yrs. The car also had a sound system and it was my dd.
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Old 12-02-2014, 04:57 PM   #4
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I haven't tried one in my mustang yet, but I had a braille 17lb battery in my c5z a couple of yrs back. It lasted a little over 3 yrs. The car also had a sound system and it was my dd.
Do you remember what you paid for the Braille battery, or where you got it?
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Old 12-02-2014, 09:46 PM   #5
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Brett Madsen uses an Odyssey PC-680 in his car (99 Roush, national SU autocross champion this year). Weighs about 15 pounds
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Old 12-02-2014, 09:47 PM   #6
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Not sure on how long it lasts. But generally around $100-110

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Old 12-02-2014, 10:05 PM   #7
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This place also sells a mount for it. I could see myself mounting this battery in a little corner in my trunk. Take about 40 pounds off the nose, and put 15 pounds in the trunk, meanwhile removing 25 pounds from the car as a whole. That right there is weight savings/distribution

https://www.speedfactoryracing.net/o...-battery-mount
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Old 12-02-2014, 10:34 PM   #8
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That's a jet ski or lawn tractor battery... I wouldn't want to trust it to start my car on a cold morning but it is a way to lighten up the car on the cheap.
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Old 12-02-2014, 10:40 PM   #9
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That's a jet ski or lawn tractor battery... I wouldn't want to trust it to start my car on a cold morning but it is a way to lighten up the car on the cheap.
We live in California, what is this cold weather you speak of? Brett literally just finished up his autocross season over this past weekend. And they already have the San Diego 2015 Autocross schedule up. Its year round racing down there.
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Old 12-02-2014, 11:03 PM   #10
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Haha.
I might use that on the car that I'm building!
I don't remember seeing anything in the rule book about battery size...
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Old 12-02-2014, 11:05 PM   #11
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I may get one when my current battery dies. Then maybe i can break 32xx pounds. Was at 3335 before the aluminum driveshaft. Can you believe Brett's car is at 2800 pounds? He is aiming for 2600s.
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Old 12-02-2014, 11:17 PM   #12
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There is a bunch of stuff that you don't need for racing on these cars but they aren't the most comfortable cars even with the "creature comforts" so, for a street driven car, I'd prefer to leave most of the stuff in the car. I can see where you can shave a lot of weight though.

Since my car won't be driven to events, I can probably get away with using one of those small batteries. I wouldn't even consider using one for a street driven car. It's way too frustrating being stranded with a dead battery...
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Old 12-02-2014, 11:22 PM   #13
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Making some sort of set up where you can swap batteries on the fly would be nice. Drive normally with the normal battery, and then drive to the event, swap the battery, put the big one wherever and have the smaller one in for the runs. Then swap it back at the end.
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Old 12-02-2014, 11:29 PM   #14
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That's a good idea!
You could put in a battery switch and have the standard battery under the hood for everyday driving and have the little battery mounted in the trunk, then when you get to the track, you remove the standard battery and switch over to the small battery.

Lol.
Everybody will be wondering WTF you're doing!
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Old 12-02-2014, 11:32 PM   #15
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Originally Posted by straybullitt View Post
That's a good idea!
You could put in a battery switch and have the standard battery under the hood for everyday driving and have the little battery mounted in the trunk, then when you get to the track, you remove the standard battery and switch over to the small battery.

Lol.
Everybody will be wondering WTF you're doing!
Time to invent that and make a lot of money..........

Make a show out of it. Make it dramatic that you are taking the battery out of your car, then when you get in the car flip a switch and start it like normal while everyone gawks.
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Old 12-02-2014, 11:34 PM   #16
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I LIKE IT!!!
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