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Making a Custom Battery Pack to Power a Desktop Board? - Page 2

post #11 of 34
What type of board is it? The easiest way to do this may be to use a PicoPSU and then hook that up to your choice of 12 volt battery.
    
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post #12 of 34
The bigger the battery the more mah they are rated at. If you want a 12v battery to last long then go with D cell batteries. A rechargeable nmh battery is rated for 1.2v, that means it would take 10 batteries (in series) for 12v. Ten D cells would be one big battery but would last the longest compared to using C, AA, or AAA batteries. The D cells would also take the longest to charge (using the same charge current). Solder the batteries like this:

+-+-+-+-+-+-+-+-+-+-

Notice 10 sets of +- for each battery. Also notice that you start with a + and end with a -. These are the positive and negative leads of the battery.
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post #13 of 34
Thread Starter 
Quote:
Originally Posted by urgrandpasdog View Post
What type of board is it? The easiest way to do this may be to use a PicoPSU and then hook that up to your choice of 12 volt battery.
I would like to use this board...

http://www.newegg.com/Product/Produc...82E16813131635

It has a DC input which I am not sure is a good or a bad thing. Lot's of features in a small package and hopefully not much power. I am afraid it will draw way too much power....so....I think I may be opting to a setup drawing less power like...

http://www.newegg.com/Product/Produc...-046-_-Product.

And if this still draws too much power, I could just opt for a Intel Atom D410 (single core) with a PCI WiFi card + PCI Ribbon cable for small form factor to accomplish something similar.

I like the Zotac however.

Thanks for all of the responses.
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post #14 of 34
Thread Starter 
Quote:
Originally Posted by AMD2600 View Post
The bigger the battery the more mah they are rated at. If you want a 12v battery to last long then go with D cell batteries. A rechargeable nmh battery is rated for 1.2v, that means it would take 10 batteries (in series) for 12v. Ten D cells would be one big battery but would last the longest compared to using C, AA, or AAA batteries. The D cells would also take the longest to charge (using the same charge current). Solder the batteries like this:

+-+-+-+-+-+-+-+-+-+-

Notice 10 sets of +- for each battery. Also notice that you start with a + and end with a -. These are the positive and negative leads of the battery.
Okay that helps things a lot. So I should get say 10 D Li-Ion 1.2Vs hook them up, shrink wrap them and you have a pack. Then what do hook that up to....
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post #15 of 34
Laptop?
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post #16 of 34
Thread Starter 
Well I was on All-Battery.com, and I found some pretty cool stuff that might be of interest.

First off they have 3.0V 900mAh C Li-Ion Rechargeables....*breath* so I could have 4 of those to total 12V. Now, if I wanted to increase battery life can I make a dual setup of 12V packs, or will that overvolt the board like crazy?

http://www.all-battery.com/rcr123a30...y.aspx#reviews

Are any of these of interest?

Chargers:
http://www.all-battery.com/batterychargers.aspx

Voltage Regulators:
http://www.all-battery.com/dc-dcconverters.aspx

Battery Monitors:
http://www.all-battery.com/batterypcbpcmbms.aspx

A big thanks to everyone staying on this thread. I can't express how much I appreciate your continued input.
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post #17 of 34
Thread Starter 
Quote:
Originally Posted by bootscamp View Post
Laptop?
Haha. Well, I trying the impossible. Trying to make a truly mobile PC with decent functionality.

A laptop would be logical. This is a personal project that I hope can demonstrate my theory.
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post #18 of 34
Quote:
Originally Posted by TheLaw View Post
.....
Well I was on All-Battery.com, and I found some pretty cool stuff that might be of interest.

First off they have 3.0V 900mAh C Li-Ion Rechargeables....*breath* so I could have 4 of those to total 12V. Now, if I wanted to increase battery life can I make a dual setup of 12V packs, or will that overvolt the board like crazy?
.....
As long as the dual 12v packs are wired in parallel, you won't over-volt anything. Two 12v 900MAh packs in parallel will effectively give a single 12v 1800MAh pack.

Quick MSPaint'd diagram of series-vs-parallel wiring:
http://i43.tinypic.com/2wri8li.jpg

Quote:
Originally Posted by TheLaw View Post
For a charger, just make sure it states that it can handle the type and number of cells that you plan to use, and it should be fine.

As for regulators, I can't help you there. Any application I have for high-current batteries has a speed control that takes care of regulation for me.

Aaaaand battery monitors. Personally, I would just get a balancer for the lithium cells and monitor the cell voltages with some kind of external volt meter. As long as a lithium cell doesn't drop below..... 3.6 volts, I believe, they should last for a long time. Over-discharging is what you're going to have to worry about. I once ran a three-cell LiPo pack (11.1v) in an RC car for so long that voltage-per-cell dropped to under 3.1v, I believe. It puffed up like a madman and was rendered completely worthless.
Edited by Untame Zerg - 4/18/10 at 7:46pm
post #19 of 34
Thread Starter 
Quote:
Originally Posted by Untame Zerg View Post
As long as the dual 12v packs are wired in parallel, you won't over-volt anything. Two 12v 900MAh packs in parallel will effectively give a single 12v 1800MAh pack.

Quick MSPaint'd diagram of series-vs-parallel wiring:
http://i43.tinypic.com/2wri8li.jpg


For a charger, just make sure it states that it can handle the type and number of cells that you plan to use, and it should be fine.

As for regulators, I can't help you there. Any application I have for high-current batteries has a speed control that takes care of regulation for me.

Aaaaand battery monitors. Personally, I would just get a balancer for the lithium cells and monitor the cell voltages with some kind of external volt meter. As long as a lithium cell doesn't drop below..... 3.6 volts, I believe, they should last for a long time. Over-discharging is what you're going to have to worry about. I once ran a three-cell LiPo pack (11.1v) in an RC car for so long that voltage-per-cell dropped to under 3.1v, I believe. It puffed up like a madman and was rendered completely worthless.
Wow thanks for fountain of knowledge!I don't deserve any of this. It will take a while for me to actually comprehend all of this but I am certain I can figure it out just like I have done with computers. At first it is all but a insane dosage of foreign material but once you learn, it becomes as easy as ABC123.

For the charger, I should be charging them externally? Can I have them internal and then have it hooked up to wall power just like any other device? (Charging while delivering power to the main board).

And finally, how would I go about making connections once i have created a solid pack or two? Do i just splice the wires and solder?

Thanks alot.
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post #20 of 34
Quote:
Originally Posted by TheLaw View Post
Wow thanks for fountain of knowledge!I don't deserve any of this. It will take a while for me to actually comprehend all of this but I am certain I can figure it out just like I have done with computers. At first it is all but a insane dosage of foreign material but once you learn, it becomes as easy as ABC123.
Fountain? Heh. To be brutally honest, I'm still somewhat new to the technical aspect of wiring stuff up.

Quote:
For the charger, I should be charging them externally? Can I have them internal and then have it hooked up to wall power just like any other device? (Charging while delivering power to the main board).
Charger. I would charge them externally for safety's sake.

Honestly, I would try wiring the charger circuitry into the battery pack and make it all one self-contained unit. That way, its just a "plug it in and go" type deal. That way, though, you would also need another power jack if you wanted to power it while charging. All the chargers I use, at least, can't supply a full 12 volts at the right wattage to power a computer, but could easily charge the batteries. So powering it while charging at the same time may prove to be a challenge.

Quote:
And finally, how would I go about making connections once i have created a solid pack or two? Do i just splice the wires and solder?
Making connections. After the two 12v packs are assembled, I would wire them up so both of their positive leads are together and attached to one prong of a connector, and same with the negatives on their side. Connectors.... Connectors... The only one's I'd trust with a high load are Deans. They may look cheesy, but remember, they handled the mega-wattage drain of a 4.5HP brushless motor.
Quote:
Thanks alot.
You bet'cha! Glad I could be of help somewhere. please keep in mind, though, that I'm not an expert. Especially when it comes to topics that deal with electrical power like this one, make sure to check all information against more than one source. I stress this even more when the power is coming from high-drain lithium cells, which are particularly..... Explosive... when improperly handled.
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