using wire glue to connect wire to batteries ? instead of battery holder...

using wire glue seems a bit amateurish, but i have tried soldering to batteries and it does not seem to be the best way to go. also that can damage the batteries i have a few projects right now, such as an fm transmitter powered by 2 coin cells and there is no room for a battery holder... (pcb i made needs to be super tiny) so wire glue? glue the 2 coin cells together, then 2 wires, and seal the whole thing in hot glue and/or duct tape... also need this to work for AA and AAA cells for future projects...

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I concur with the previous answer being the most cost effective. Find an electronics parts store and buy a battery holder. Example is here: http://www.batteryspace.com/index.asp?PageAction=VIEWCATS&Category=837

To answer your question, you can solder directly to the cell. The alternative is to use a spot welder, which can cost about $300. To solder to the button cell or AA battery, you need high heat, high watts, flux core solder (63/37 pb content) and minimize your contact time with the cell to avoid damage. I have used a soldering gun purchased at Radio Shack for $15, soldering irons just don't have enough watts. The gun is 250 watts I believe. Turn on the gun and wait about 3 minutes for max temp. Lay the tip of your solder wire across the battery contact, and touch the solder with the tip of the solder gun not only until the solder melts, but until the solder starts to spread across the surface of the battery contact. This is called 'tinning' To solder two button cells together, lay the batteries side by side and lay a small bit of copper wire across the both of them. Solder the wire to the batteries where you have already 'tinned' the battery contact. Fold the button cells back onto themselves and there you have it!

I have to just say I like your username I saw it and started doing backflips

FIREBIRD

raykholo (author)  firebird9820028 years ago
i have lots of experience soldering, and this is pretty much the technique i have used always to solder to batteries. however, i have a 30 watt radioshack soldering iron and it is tedious work i would be happy to use a battery holder or clip, but my projects are tiny enough where this is not an option as for soldering to cells, again it is tedious work and the heat can damage the cells i have also designed pcbs ( 2 sided) where all the components are on the top and then the battery holder could be soldered onto the bottom.. however, my current project is a single sided board with smt components on the bottom so this is not exactly as suitable as those other scenarios mentioned... its also quiet amazing how many people work with soldering in the exact same way that i do ( read comment below with orksecurity for even further confirmation of that)
Joshuas772 years ago

I Just made a cell phone charger and yes you can use the glue I was able to get six wires all connected. You just have to make sure that the wire is touching the metal or it won't work cause the glues not conductive.

klee27x8 years ago
If you find yourself in this situation often, I recommend you buy yourself an engraving tool and some ACID-based flux. Yeah, acid flux is not recommended for electronics, but batteries terminals and other large bits of steel are not your typical electronics. Use the engraving tool to burnish a spot on the battery. Put a little bit of flux on the spot. Then pretin the battery with some solder. Finally, join your pretinned wire onto the pretinned battery terminal. If you use the fat portion of a hot iron, it shouldn't take more than half a second.
raykholo (author)  klee27x8 years ago
that last part is actually a really good idea, as solder only sticks to the tip in in all my experience at the moment, i just scratch up the battery terminals with an exacto, no flux or engraving tool and its working out ok the 2 are pretty similar though...
orksecurity8 years ago
"Wire glue"? I don't know of anything which meets that description. Most glues are nonconductive, or so poorly conductive that they wouldn't be suitable for this application. What I'd suggest for your coin cells is one contact directly on the board that one cell presses against, a metal clip pressing down on the battery stack (be sure to insulate the place where it passes the edge of the lower battery) -- and then shrinkwrap or elastic tape or something of that sort to keep the batteries from sliding out of alignment. You might be able to get away with just bringing a wire up to rest on the top battery and counting on the tape to hold it in place. Or two wires shrink-wrapped to the batteries and leading back to the PCB. (Don't the "LED Throwies" use that approach?) For the larger batteries: I'd suggest buying a clip; on that scale it won't make much difference and it'll save you a lot of time debugging bad power connections.
raykholo (author)  orksecurity8 years ago
yes, this idea was based on the led throwie approach, cool that u figured that out

this is the wire glue i am talking about and im pretty sure that it is conductive enough link

also my idea was, as u described taping wires to batteries, although u did a better job explaining it. But i wanted to glue the wire to the battery, then tape and/or hot glue the connection to keep it there

u really understood the plan i had, now just please rethink it after reading about the conductive glue i was referring to. there are also instructables on the topic...
I still think glue is not likely to work as well as you want it to. But go ahead and try it; all you'll have wasted is some time and a few bucks worth of parts, and I could be wrong. (I'd be surprised, though.) And actually, I agree with the other observation that soldering may not be a bad idea -- but since you specifically asked for a no-solder solution I was trying to give you one.
raykholo (author)  orksecurity8 years ago
well that is appreciated really soldering for me is no problem at all, but i was looking into other ways to make that happen i might give this a shot, but probably gonna try the soldering method again before that thanks