Hi,

For My R/C systems, I only need to know if batt is under 4v4 ...

at 4.65v, there's the MC33064P5 from motorola ( µChip equivalents exist ...)

It's a TO92 case ... and output is open collector, low for lowbatt.

The MC 33164P5 ... has a 4.3v trip point.

Moreover you can add as much hysteresis as you want adding a couple of resistors

sooooooo simple to check a low input state ... rather than use an ADC !!!

Alain