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Yes, the low battery cut-outs I have seen turn off around 10.5V. I built one of those **** Smith kits a couple years ago and it works fine for me. You can adjust a pot that varies the cut-off voltage for whatever you want. I also changed the relay for a mosfet so it is sold-state.
This does not tell you the battery condition at a glance though. You can build a battery level meter with a quad comparator chip. I use one of those on a 12V Lead Acid battery. It has a four led bar graph and I just look at it to see the state of charge. Very easy.
Doh, RAJAH got in before I finished typing. Yes I agree, make sure your DMM is accurate. You don't want to adjust it to turn off at 10.5V when it is actually 8V or something like that.
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