If you really want to go the battery building route, there are some things you must do.
- Buy a Kweld (and a lipo to power them)
You do not want welds popping off, which you will get with any cheap (<$200) spot welder. These aren’t portable chargers or powerwalls, they are skateboards vibrating down the road at 20+ mph. There are a lot of stresses on every part, including the battery.
A Turnigy Graphene 3s 5Ah lipo has enough current to power it. You can get it from hobbyking.
You will also want to practice alot and get the welder tuned up. I recommend that you get some of these practice cells and maybe even build a practice pack before you go live.
- Read as much of the Battery Builders Club as you can.
There many posts in there, but it will show you the good and the bad of battery building. Another good topic is Esk8 Battery Building for Dummies
- Post many many many many pictures to the battery builders club thread.
There are many experienced builders there that can help you throughout the build. Before you every step, send a pic and let us make sure there are no errors with your plan before you blow yourself up. There’s a good chance that your first battery will be bad or sketchy, thats why I reccomend you build it with practice cells and send the pictures there before you build the real deal.