I know this command on a mac terminal will report the bluetooth keyboard?
$ ioreg -c AppleBluetoothHIDKeyboard |grep '"BatteryPercent" ='
Is there a way I can get the batterypercent to be emailed to me or updated in the audit for the machine?
I tried that on latest Mac OSX (El Capitan) and didn't work. Try
ioreg -n "BNBMouseDevice" | grep -i '"BatteryPercent" ='|sed 's/[^[:digit:]]//g'
This gives you just the digits