Koopatronics N64p v1.0 (STATUS: assembling batteries)

deviouskoopa · Post by **deviouskoopa** » Wed Jan 14, 2009 9:31 pm

Well I got my screens today (I think they arrived yesterday, but I just got back to school today), so now I'm just looking for an N64 and then I'll order the rest of the components online, hopefully in the next week or so. That's it for now...

deviouskoopa · Post by **deviouskoopa** » Wed Jan 14, 2009 9:45 pm

By the way, here's the same (set of 4) Zenith 5" screens that I just bought for about $31 each...

http://tinyurl.com/99hyme

(I posted this in the Trading forum too)

deviouskoopa · Post by **deviouskoopa** » Fri Jan 16, 2009 6:00 pm

Thanks for the help from Bacteria in my other topic:
http://forums.benheck.com/viewtopic.php?t=27908

So I figured what I'm going to do for my battery configuration. I ordered 4 7.4V 2-cell Li-ion protection PCBs (and the PTH08080) today, but I still need a charger.

1. Any suggestions/links?

I will have 4 sets of 2-cell 7.4V w/ PCB wired in parallel...
Actually I have a question regarding this diagram:

If each cell is 3.7V, and the batteries were originally wired like this with 5200 mAh for 14.8V:
http://img141.imageshack.us/my.php?imag ... ramuf9.jpg
(4 parallel 3.7V cells in series = 14.8V)

2. Would my mAh be doubled at 7.4V, or what would it be?
(I think jj hammerstein first suggested this idea)

dragonhead · Post by **dragonhead** » Fri Jan 16, 2009 6:15 pm

deviouskoopa wrote:Thanks for the help from Bacteria in my other topic:
http://forums.benheck.com/viewtopic.php?t=27908

So I figured what I'm going to do for my battery configuration. I ordered 4 7.4V 2-cell Li-ion protection PCBs (and the PTH08080) today, but I still need a charger.

1. Any suggestions/links?

I will have 4 sets of 2-cell 7.4V w/ PCB wired in parallel...
Actually I have a question regarding this diagram:

If each cell is 3.7V, and the batteries were originally wired like this with 5200 mAh for 14.8V:
http://img141.imageshack.us/my.php?imag ... ramuf9.jpg
(4 parallel 3.7V cells in series = 14.8V)

2. Would my mAh be doubled at 7.4V, or what would it be?
(I think jj hammerstein first suggested this idea)

to make things easy, lets assume each individual battery is 1000mAh.
series multiplies voltage, parallel multiplies amperage capacity. so each pack of 2 (wired is series as shown) will be 7.4v@1000mAh. the diagram shows 4 of these packs, wired in parallel to each other. therefore your whole pack will be 7.4v@4000mAh.

deviouskoopa · Post by **deviouskoopa** » Fri Jan 16, 2009 6:20 pm

Oh and what would be the difference if I did this configuration instead:
http://img291.imageshack.us/my.php?imag ... am2ln0.jpg

deviouskoopa · Post by **deviouskoopa** » Fri Jan 16, 2009 6:29 pm

dragonhead wrote:to make things easy, lets assume each individual battery is 1000mAh.
series multiplies voltage, parallel multiplies amperage capacity. so each pack of 2 (wired is series as shown) will be 7.4v@1000mAh. the diagram shows 4 of these packs, wired in parallel to each other. therefore your whole pack will be 7.4v@4000mAh.

So would each individual cell have 2600 mAh since the original configuration had 2 rows of cells in parallel? That would mean config #1 would have 4 sets in parallel to yield 10400 mAh total, and config #2 would be the same total Amperage but with twice as much going into each protection PCB as config #1 (logically, since there are half as many PCBs)...

deviouskoopa · Post by **deviouskoopa** » Fri Jan 16, 2009 6:43 pm

http://www.batteryspace.com/index.asp?P ... rodID=3379
Is that a decent charger? How can I tell if my batteries can handle 1.5A charging?

dragonhead · Post by **dragonhead** » Fri Jan 16, 2009 6:50 pm

dude first of all, you can edit your posts to add more info.

that 2nd setup would have the same capacity and voltage just with the extra protection circuit.

just do the math out yourself. work out the individual pack's voltage and amperage, then multiply the amperage by how many packs are wired in parallel to each other. its not that hard.

as for the charger, itll work fine. with either diagram you have.

deviouskoopa · Post by **deviouskoopa** » Fri Jan 16, 2009 6:52 pm

dragonhead wrote:dude first of all, you can edit your posts to add more info.

that 2nd setup would have the same capacity and voltage just with the extra protection circuit.

just do the math out yourself. work out the individual packs. then work out how theyre wired together with each other. its not that hard.

Sorry... just making sure I don't blow myself up. Thanks I guess.

dragonhead · Post by **dragonhead** » Fri Jan 16, 2009 6:59 pm

yeah ideally. you want a protection circuit on only as many cells as its rated for.

ok to avoid confusion what are your cells rated for? what is your protection circuit rated for? you can feel free to contact me on AIM or something if you want to discuss this in more detail. im pretty good when it comes to batteries.

dragonhead · Post by **dragonhead** » Fri Jan 16, 2009 7:55 pm

try that on for size.

deviouskoopa · Post by **deviouskoopa** » Sat Jan 17, 2009 1:30 am

dragonhead wrote: try that on for size.

Okay thanks again

And to charge the batteries, I just plug the charger up to the P+ and P- wires right? (be easy haha...)

dragonhead · Post by **dragonhead** » Sat Jan 17, 2009 1:45 am

deviouskoopa wrote:
dragonhead wrote: try that on for size.
Okay thanks again
And to charge the batteries, I just plug the charger up to the P+ and P- wires right? (be easy haha...)

bingo.

deviouskoopa · Post by **deviouskoopa** » Tue Jan 27, 2009 4:07 pm

Okay I got my protection PCBs and the charger in the mail finally... so time to get to work on this marfar!

But does anyone know what gauge wire I should use for each part of the circuit? (I have 22awg) I'm not even completely sure how many amps each wire will carry...

Also, should I use clear-flux solder or rosin-core solder? I usually tin the iron tip with the clear-flux and then solder the joint using rosin-core (not that I know if what I'm doing is helpful/efficient at all haha).

XCVG · Post by **XCVG** » Tue Jan 27, 2009 4:35 pm

deviouskoopa wrote:Okay I got my protection PCBs and the charger in the mail finally... so time to get to work on this marfar!

But does anyone know what gauge wire I should use for each part of the circuit? (I have 22awg) I'm not even completely sure how many amps each wire will carry...

Also, should I use clear-flux solder or rosin-core solder? I usually tin the iron tip with the clear-flux and then solder the joint using rosin-core (not that I know if what I'm doing is helpful/efficient at all haha).

For the wire 22awg should be okay. 18 would be better if you can find some.

I've never heard of clear-flux solder so you should probably use the rosin core.

About the protection circuit dragonhead's diagram is correct. You shouldn't hook up four cells to a two-cell protection circuit. Also I don't think you need a charger, just a power supply, but I'm not sure.