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Old Oct 21, 2003, 08:31 AM
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Newbie: How to make your own battery packs?

Hi gang. I was wondering if there was a good website out there that detailed how to go about making your own battery packs? I fly sailplanes, so it would be for the receiver only, but I thought this was the best forum to post the question. Thanks!

Dave
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Old Oct 21, 2003, 08:41 AM
now that's a wattmeter...
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You probably want a 4-cell brick pack in that... from the end it looks like this:

oo
oo

The battery connections would then be like this:
- +
+ -
Connect them in series with copper braid or battery bars, attach a servo connector for supplying power to the receiver, and you're set! Do ask again if you're not sure...
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Old Oct 21, 2003, 08:49 AM
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In series

When you say connect in series, you mean connect eact positive to a negative. Like this picture attached?
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Old Oct 21, 2003, 08:52 AM
now that's a wattmeter...
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Something like that, but the way you drew it, it looks like you're short circuiting the pack. Work cell by cell and you'll be fine.
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Last edited by simingx; Oct 21, 2003 at 08:54 AM.
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Old Oct 21, 2003, 09:08 AM
now that's a wattmeter...
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A picture speaks a thousand words...
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Old Oct 21, 2003, 09:09 AM
now that's a wattmeter...
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The other end:
Red lines are where you should solder copper strips.
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Old Oct 21, 2003, 09:12 AM
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Ahh! Crystal clear now. Thanks for attaching those pics! Now as far as the servo connector goes... where in the mix does that get attached exactly?
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Old Oct 21, 2003, 09:20 AM
now that's a wattmeter...
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Can't remember where I got this picture from, but it tells all. Note that modern Airtronics stuff has the same pinout as JR, Hitec and Futaba.
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Old Oct 21, 2003, 09:34 AM
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Cool, great pics! Ok, so the positive wire would be soldered to the positive end of the battery (area "A" from the above pics), and the negative lead to area "D"? Where does the third "signal" wire get soldered to?
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Old Oct 21, 2003, 09:43 AM
now that's a wattmeter...
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Yup, and the "signal" wire is not connected for a battery pack..
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Old Oct 21, 2003, 10:06 AM
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Wow, in the coarse of a few minutes, I learned how to make my own pack! Thanks so much simingx!
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Old Oct 21, 2003, 01:03 PM
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How do you solder to a battery without overheating the cell?
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Old Oct 21, 2003, 01:45 PM
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Quote:
Originally posted by azjerry
How do you solder to a battery without overheating the cell?
Use a powerful soldering iron, around 30-40 watts for AA's. This is the trick - a quick touch of a hot iron does the job without heating the cell - a long touch of a small iron will heat the cell without allowing the tin to flow.

Clean the surfaces thoroughly and tin them. I use solder paste to make the tin flow even better. Then tin the wire. Now make the joint - just touch the tinned wire to the tinned surface and touch them quickly with the iron - done!

/ Jonas
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Old Oct 21, 2003, 04:35 PM
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But to tin the surface on the cell you need to heat it enough to melt the solder too.

Or when you tin the cell do you mean to just clean and apply flux / paste to the cell? Or have I forgotten some finer point of soldering (entirely possible)?
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Old Oct 21, 2003, 04:43 PM
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Quote:
Originally posted by azjerry
But to tin the surface on the cell you need to heat it enough to melt the solder too.

Or when you tin the cell do you mean to just clean and apply flux / paste to the cell? Or have I forgotten some finer point of soldering (entirely possible)?
Yes, you do have to heat it enough to melt the solder - but don't worry. The point is to make the process as quick as possible - not to not heat the cell at all. It is perfecly OK - you will not destroy the cell by tinning it. To my knowledge I haven't damaged a single cell - and believe me I messed up pretty badly in the beginning, having to tin, retin, retin, then solder and finally resolder... They take more abuse than you'd think, just try to be quick and you'll be fine. Being quick is greatly aided by an iron with some degree of power.

/ Jonas
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