Not enough information. You need to know how much current the LEDs draw. Plus the door buzzer and interior lights. A good estimate is to take the amp/hour rating of the battery and divide it by the current draw. There are other factors, but this will get you in the ballpark. As a simple example, if your battery is rated at 2 amphours and you are drawing half an amp, you can expect 4 hours of power. -- Mike -------------- Original message from "daviddelorean" <daviddelorean@xxxxxxxxx>: -------------- > I'm trying to figure out how long a fully charged battery will last. > What is the mathmatical formula for doing it? All my lights (except > headlights) are LEDs. The tail & front market lights have 45 diodes, > the side markers have 3 diodes, license plates have 6 diodes, door > markers (assuming I keep the doors open) have 6 diodes. > > So with doors open and parking lights on (headlights off) how long will > my batter last from a full charge? > > > > To address comments privately to the moderating team, please address: > moderators@xxxxxxxxxxx > > For more info on the list, tech articles, cars for sale see www.dmcnews.com > > To search the archives or view files, log in at > http://groups.yahoo.com/group/dmcnews > Yahoo! Groups Links > > > [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/