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The british medical council and various goverment departments have said no harm can be done to any patient or equipment inside an hospital by the use of a mobile phone ,but we are still not allowed to use a mobile in a hospital.
Except, possibly, to the mental health of the patients.Being stuck on a train next to someone with a mobile phone and an apparently endless list of friends to repeat the same dull story to is bad enough, imagine if it went on for a couple of days... when you're feeling off colour anyhow... Misanthropic? Moi? Never!
Given all the electrical activity that anyway happens on a garage forecourt (from within the engine, even the possibility of a static spark as one leaves or enters the car), I really cannot see that a 3V or 6V battery is going to be much risk, nor the 1W (maximum) RF transmission.You are probably right. There are 50 odd pages discussing the probability at www.hse.gov.uk/RESEARCH/crr_pdf/1997/CRR97146.pdfThe maths is beyond me but I believe that formulas in this document will establish how likely ignition is.