It doesn't matter what kind of a battery you have, they do not live long in a constant state of discharge. If it goes dead you are not going to fully recharge it by running the motor. Repeatadly part charging and then killing the battery is VERY BAD for it's service life as you have just found out. The best thing to do is to recharge it slowly like John says and then test the battery, the alternator, and find the reason it goes dead. You can use a voltmeter to test it but the "best" way is to load test it. The master switch is also a good idea especally if you don't use the car often (like once a week). Dirty connections can keep a battery from being fully charged and will make it seem like it is not fully charged when you try to start the car. John is also correct in saying that using the alternator to "bring the battery back from the dead" is much harder on the alternator than to just bring it back up to a full state of charge after starting the motor. The theory here is that the alternator is just supposed to "top off" the battery after starting the car. The car and all it's accessories is "supposed" to be fed from the alternator. This is not always the case, particularly when the car is idling so the battery helps some (but not if it is bad or has dirty connections). David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@xxxx> wrote: > Joe, > Your the second person that had a bad experience with an optima battery. The > other person burned up an alternator regulator because the new Optima > battery was shorted. 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/ <*> 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/