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I didn't realise you had a 12V battery to measure. That's a different
problem to the solution I suggested with a V+ the PIC can handle

This circuit is one I use with 6V sealed lead batteries, which can
be over 7V fully charged. You'd need to adjust the B+ divider for
12V. A TLC271 in low-power mode needs only 10uA, no problem
to power it from a PIC pin. Similarly the Vreg divider could also
be powered by a PIC pin if you have one available (I didn't). If you
did both of those things, the only quiescent current would be across
the B+ divider

I'm sure it would be possible to use a divider on the base of a
transistor or gate of a FET to achieve the same result. If it's a
sealed lead battery there's a definite low voltage to be alerted
to, perhaps a divider that will flip a semi at a fraction over that ?

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