Agreed Jimmyjames, they shouldn't fail. And they probably won't. But a soft solder joint is so much weaker than a weld and so much easier to get wrong and not know it, and figuring there's 10 of them in a 4.8 pack, the chances for one of them failing are far higher. Other guys can do what they want to, but for me it's all welded packs with Sanyo cells. Buying from hangtime, I can't save $10 per airplane buy going the cheapo route on Nicd's. For $10, I'll buy the best and not have to worry about them.