It all depends what you are trying to do. If you already have a commercial assembly with a mount for a battery pack, then you want the standard battery to fit it.
As Jeremy says, building cells up into a pack can be a pain. You know how you find there is always one part of a project that takes the time - well, building the battery pack and case has turned out to be that part on my current project. It has fought back every inch of the way. Other bits have just fallen into place.
Nick
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