--- In dmcnews@xxxx, sand131@xxxx wrote: > Dear Claude: > The 1% per day Rule is interesting But can you tell us where you got it? The > reason I ask is that I disconnect my battery every fall and start the car in > the spring when the battery should be aprox 125% discharged? > Ralph > VIN 1606 since 1985 > > Yes,that is the basic average that a typical lead acid battery discharges,it could devate with a gel type car battery,( and your results may devate somewhat)but again it also depends on your climate conditions,if it is always in a warm climate (Hawaii,Flordia ect)it might be a less percentage,a colder climate (Alaska,Canada ect)it might be a higher percentage,the reason for this is that the battery is an electrochemical device and,as is the case with virtually all chemical actions,it is aided by heat(temperture),Example,if the capacity of a CCA of a battery at 80 Degrees is given as 100 percent,at 32 degrees the capacity will be only 65 percent and at 0 Deg.only 40 percent..Remember,that a lead-acid battery is not a storage tank for electricity,but is a electrochemical device for converting chemical energy into electrical energy,and the more it sits idle(not being charged)the more the lead plates absorb the electrolyte(sulphuric acid)at a typical 1%(one percent) a day (your results may vary somewhat) until you start the process of chemical reaction(charging the battery,by running the engine) Where I got the info on Discharge rate?I remember reading it in a Book about automotive batteries. Claude 000570