Resending with the tag ... sorry.

I've got a cell phone Lithium battery that I want to use in one of my
projects. This particular battery is Motorola SNN4814, 3.6v, but I think my
questions applies to many other types as well.

The battery package consists of a proper battery and, presumably, some
protection circuit, and has four terminal plates. My questions are:
    What these four lines are used for? Is there any freely available
specification applicable to this thing?
    What would be a better way:  to use the battery package as it is,
connecting it through the existing 4 lines, or to get rid of the electronic
circuit and use a bare two-terminal battery? (In latter case I will have to
supply some kind of protection circuit by myself).
    Have somebody used these batteries, and how?

TIA

            Arkady

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