johnbjuice - the heat from a soldering iron is not good for a battery and in any case, you can't seem to solder to the terminals, they resist.
My "trick" with hot glue and bolts is really strong and gives guaranteed strong electrical contacts. I used this for the watch batteries to connect to the memory card in the N64 project. I have also used this elsewhere too. The point of this also is that it causes no damage to the battery, even when removed and is rigid.
Life of Brian wrote:I think that's really clever bacteria. I'll keep that trick in mind for future projects - it would be handy when making something real quickly.
Thanks mate! When I needed to connect a battery a while back to wires I thought of using tape, but of course the wire can work free after a while, especially if the battery gets tugged. That's when I came up with this idea, after a bit of thought; works great - simple, secure, permanent contact, yet can be easily undone!
I know this post is kind of old, but I thought I'd add my two cents on soldering batteries. In order to solder to batteries, you need a pretty hot iron and you need to scuff up the battery terminals before beginning. You just need to be sure to only keep the heat on long enough to get the terminals tinned. Once all the terminals are tinned, you can use a lower wattage iron to attach your wires. I use desoldering braid for the connections between the terminals on my packs......it's super conductive and flexible.