I called em and asked. The dude said they wanted to "improve" the product, from which I inferred it wasn't working as designed.

Scroll down to the 2nd and 3rd fro last items on [link=http://www.hkm-models.com/Emcotec%20DPSI%20Systems.html]this page[/link] and you will see that Emcotec sells some neat, albeit expensive, battery monitors.