I've used a 40watt Wellar iron many times for soldering battery packs.... That's the easy part... getting enough practice and experience is what takes the time... not that any of it is difficult.. once you've done it a few times... the only way to get experience is to.. do it.... and sorry to say... there are no special tools that will get you experience.
No specialty tools required to build a battery pack though... only experience.. it seems some here have more of that then others doesn't it... we can only be our own judge though can't we.
Experience tells me anymore that with very decent battery packs available in many configurations.. at very reasonable prices.. I'll buy a RTF pack and be done with it. Theres not a whole lot of savings in building your own... matter of fact.. if you don't get it right and perfect... it could cost alot more then the price of a battery pack when said and done.
