Maxim makes fuel gauge ICs for the exact application you have in mind; look
at their app notes in battery management and you will find good ready to use
circuit blocks to do this.
Madhu

-----Original Message-----
Hi,
    I need to measure the voltage of a battery. The problem is that the
PIC i'll use (18F452) will be powered by the battery whos voltage I want
to measure.
    It's for a hand held equipment and I want to be able to show how
much battery "is left" on a LCD display... any ideas?
Mauricio

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