Strange formula - never heared something like that before. Why would somebody divide it thru 25 ? I have never seen that on car batteries. Where did you find that stuff ? Would be interesting to see even though it is not really applicable on cars. Elvis...9 years on my daily-driver's battery....BOSCH Silver... > > Batteries specify reserve capacity as "so many minutes at 25 Ampere load" > > The mathematical formula is: > > "reserve capacity" times 25, divided by the current drain from the > LEDs. Yields capacity in minutes. > > Here's some hipshot math with a fictitious battery. > > 120 minutes reserve capacity times 25 = 50 amphours. 120 leds draw > about 2.4A. Could be 1.2A, could be 4.8A. > > That would yield a spread of 10 hours to 40 hours useful time. > > You could measure the current drain with a current meter, and get more > accurate results. The reserve capacity of your battery might be > written on it somewhere, probably in teeny tiny letters. > > Rick > > --- In dmcnews@xxxxxxxxxxxxxxx, "daviddelorean" <daviddelorean@> wrote: > > > > 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 <*> 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/