Road Angel Nav flattens battery?

[sjp63]

BMW wouldnt start yesterday - flat battery. Its only 3 years old and ive had it from new with no problems. Only thing I did differently was to leave the RA Nav plugged into the cigar lighter for about 5 hours on the drive by mistake.

Could that have done it?? the RA is tiny and shouldnt have drain the battery surely?

[Tripps]

sjp63 said:

Could that have done it?? the RA is tiny and shouldnt have drain the battery surely?

Any satnav type equipment will use more power if it can't gain a signal than when it can (in a garage, satellites obscured by buildings etc.), so if left it will use a steady but low amount of power over time.