Dec.26 Battery FB start

Lego original Battery info documentation:
Battery info is part of the data recieved from the AVR as explained on  p.20 in  Lego Mindstorms NXT (TM)  Hardware Developers Kit 
Battery word contains the 

• voltage (mV) = bits 0-9 * 13.848
• not supporting float so multiply by 1024 * 13.848=  14180 then divide by 1024
• alternative: would be to just use relative power of 0-1023
• accu pack inserted bit (bool)  bit 15
• The accu pack has peg-like tab that pushes battery setting, when its inserted.
• avr firmware major.minor version (xx.yyy) bits 13-14 major; bits 10-12 minor
• AVR firmware version will be given its own FB if its ever needed.

Interesting lms Battery links:

Battery discussion in thenxtstep blog

Interesting study of NXT battery power levels: