For those interested in the state of their battery I picked up an information sheet from "Battery World" which estimates the percentage charge in your battery based on the ambient air temperature and the voltage of your battery. To read the chart, on the left is ambient air temperature in fahrenheit and celcius, and on the right (ignore the middle column) is the battery charge (percentage) remaining based on the voltage.
I was surprised to find my X5 and 135 was only sitting at approx 55% - the 135 will be in for some extra volts tonight!
