Mine weighs 4.2lbs with the mount!

In the unfortunate quest to mod the car I decided to get short route ETS UICP pipes. Well now I need a mini battery or a relocate kit...problem solved! Perfect timing for my newest adventure in the battery scene. I have recently built a 1.1lb battery for my bike (soon to be .55lb) and decided why not the car!

These are "A123" cells, or LiFePO4 for their actual name. These are not Lithium polymer. If you can't get that through your head please stop reading. If you have a buddy who has a radio control airplane/etc he will tell you batteries blow up. That's great, they do, but not these and not in this use. If you want to know why, you can PM me and I'll tell you.

I built this pack at work using high quality equipment, I am a electrical technician by vocation. I soldered these packs together. This pack is rated at 600CA, same as the stock battery. I used 20 cells in this configuration. If I was a hardcore racer, I could probably get away with 16 cells for some awesome weight savings.

I only drive my car on the weekends and have let it sit for up to 2 weeks and it starts up fine. This is of course in an attached garage so it never gets colder than about ~30*F. I did let it sit outside the one night and it was ~10*F in the morning and it was slow to turn over the engine (running E85 by the way), but once it got the 2nd rotation going to started up fine.

Been running it for about 1.5 months now with no problems at all. I have been using the one in my bike for over 4 months with no problems, including 1 month sitting in the garage with a perfect start-up.

Now some pictures!





Now the mount is painted black, not sure where the newer pictures are...

Here's a video to show it off!
http://www.youtube.com/watch?v=0Wn2Have9ic

Drag/AutoX guys drool away .

 

how much does something like that cost to build???

 

what ever a stock battery weights..!

 

Homemade goodness I really like your creative ways!!

 

Wow nice, I'd like to know the cost as well. Only other choice for such weight are:

http://www.voltphreaks.com/products_street.php

Just way to expensive for something to replace often.

 

Yea those are ridiculous costs, I built mine way cheaper lol. Why would you have to replace it often? The shallow cycle life is rated for 300k cycles. I think the stock weighs in at 32lbs with the mounting tray.

 

I think the stock ones are 18kg (38lbs), not sure how much the tray weighs because I never took them out. I'm currently using Braille B106 at the moment, its only 130 dollars and weigh 6.5lbs. I usually replace batteries once every 2 or 3 years, but then that is because I don't really take a good care of them and don't disconnect before long breaks.

 

My battery weighs 23lbs, plus the stock mount so i guess about 24-25 total? I like this idea, pretty innovative way to do it and I like the custom mount you made for it. The only thing that sucks is that you wouldn't be able to track the car with a battery mounted like that.

 

Really? Does it need a strap across the top?

 

Now that's what I call a Mini-Battery!

 

Wow, that's crazy light. So small. Good work!

 

Is that a Fluke Mulitmeter? lol



Awesome stuff, but get a strap across the top of that battery. You don't want all that hard work flopping around without a tie down.

 

It's not a Fluke, although I have a Fluke 87 but the battery was dead at the time. The mount holds the battery just fine, no need for a strap on top for additional support.

If you like the Fluke you should see the Tektronix scope I have at work .

 

I have a Fluke 88 I use for work. That is one bad *** oscilloscope. I thought my Snap-On Modis was cool.

 

Yea, they need a strap across the top and a nice solid mount in case of a rollover so the battery stays in place and doesn't come in contact with anything and start a fire.