...I have to be careful with the Gen 1 that if I am not running above 1500 RPM with all of the heated gear on, Jacket, gloves and grips, I am drawing down the battery. I run the Clearwater Voltage monitor and it is easy to keep track.
[iMO] I'm not so sure of the value of the Clearwater Voltage Monitor which for ~$60 will tell you that 12.1 volts is an acceptable voltage for normal riding. [/iMO]
As I get older my hands get colder. Right now I'm using Oxford grips and V-Strom hand guards with good winter gloves that have heated grip friendly palms and this combo lets me ride below 20º F without cold hands or fingers. I couldn't do this with the Gen I OEM grips. What I need now is heated levers for when I have to sit in traffic and hold the clutch and/or brake. I'm sure that heated gloves or liners would be as good or better but I'm not into the extra wires and like having the grips always ready should the need unexpectedly arise, such as rain, a blown forecast or an unanticipated trip up mountains.