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Old 12-09-2012, 04:11 PM   #1 (permalink)
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Default IMA battery case.

Does any one have a empty IMA battery case with the electronics and cooling fan still attached cheep or free for the taking? I'm working on an idea for replacing the battery with some thing different and making it fit in the case and still mesh with the cooling, voltage converter and computer interfaces.

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Keith
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Old 12-09-2012, 04:45 PM   #2 (permalink)
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We are intrigued but have no idea where you live.
Remember this is an international site.
Please update your profile with your location.

Battery Cases with switch board attached are quite sought after by our battery refurbishers so I doubt you will find a free or very cheap one.

Perhaps if you gave us a few more details of your plans that might encourage someone to help you out.
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Old 12-09-2012, 05:44 PM   #3 (permalink)
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Sorry,

I'm in California, city of Sacramento. Don't want to tip my hand early (would like to see if it works before the big reveal) if everything works as I think it will, it would be a IMA replacement option that would last 1,000,000 charge & discharge cycles.
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Old 12-09-2012, 05:55 PM   #4 (permalink)
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1,000,000? ROFL good luck with that.

What, are you putting a ton of nickel-iron batteries in there?

In fact, even those won't handle a million cycles, even though they're usually rated at 25 years or more... what, did you find some experimental potassium-ion batteries somewhere?

Somehow managing to cycle your battery 30 times a day, every single day, 1,000,000 would be 91 years. Magic!

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Old 12-09-2012, 09:55 PM   #5 (permalink)
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No magic involved and the 1,000,000 cycle life is from the manufacturer, so I don't know how realistic that number is. Like I said it's an experiment, but it should be fun, however it pans out.

Keith
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Old 12-09-2012, 09:58 PM   #6 (permalink)
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No magic, and that cycle number is from the manufacturer, but I don't hold my breath on that being accurate. Time will tell, in any case it's going to be a fun experiment!

Keith
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Old 12-09-2012, 10:58 PM   #7 (permalink)
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Sounds cool! I assume you're looking at li-ion/li-po batteries? Or perhaps LiFePO4?

If so, you just have to make sure they're rated for the same charge and discharge rates of the original cells. Also, I'd be afraid to have li-ions in my car; a bad enough rear-end collision could rupture the cells and cause them to catch fire/explode.

But, sounds like an interesting project, so good luck, and keep us updated!
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Old 12-09-2012, 11:25 PM   #8 (permalink)
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Cool to see another Sac Insight owner here. The only Insight I ever see around here one in the teacher parking lot at Sac State. I keep meaning to peek inside to see if it has any mods.

What part of Sac you from? Would love to see what you're working on.
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Old 12-09-2012, 11:27 PM   #9 (permalink)
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No fear of fire or explosion, rated at 100A charge discharge rate like the original batteries. Will keep everyone posted as testing progresses.

Keith
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Old 12-12-2012, 09:47 PM   #10 (permalink)
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Cycles alone is an arbitrary number. It's like stereo wattage. 1000 Watts! That will be awesome! Oh wait.. 1000W peak at 1KHz for 0.02 seconds………. and 20 watts RMS. Fail.

A typical NiMH battery might give you 500-1000 cycles at 100% Depth of Discharge(DoD) to End of Life, typically 80% of original capacity.

The same NiMH battery could give you hundreds of thousands of cycles at less than 100% DoD. This is the reason why the Honda system, for example, only uses the battery in the 20% to 80% range, representing a 60% DoD. The Prius, is even more conservative at 40%, which is probably the primary reason its batteries seem to last longer.

You could probably get 5,000,000 cycles out of one of our batteries.. If you discharged and charged it at 5 amps with a 1% overall DoD, say 90% to 91%.
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Last edited by Eli; 12-12-2012 at 10:04 PM.
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