> 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?

        Generally the best way to go about it is to find out the datasheet of the
chip in question and deduce the circuitry. There is no "standard" that
manufacturers follow. The chip itself is often more then just protection,
for some batteries the chip IS the battery charger, you just supply the
"battery" power and it charges itself, the extra lines used for status
checking by the host. TTYL

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