my best friend collects junk batteries, sorts thru all he gets for ones that are still usable and puts them to use on his windmill. the cost of new batteries exceeeds the value of electricity his 14 foot wind machine can generate at many times of the year. i give him my olds batteries when they are ok.
smart folks dont wait till they completely die! I used to do that but not only is it inconvenient but leads to many more alternator failures. I now buy premium batteries, with longer warranties but replace them every 3 to 4 years.
a new batter costs say 80 dollars, divide by 4 years thats 20 bucks a year. sure i might get 6 years out of the battery i tossed, but that only changes the cost per year to about 14 bucks. runs risk of getting stranded usually in zero weather when marginal batteries are more likely to die:(
truly what is 6 bucks a year??? for convenience. I tend to holds onto vehicles forever, while many buy new cars, now THAT costs thousands extra while mine a measely 6 bucks a year.
lots of people replace them early and the batteries are available:) garages just toss recycle them anyway. once the collecting person accumulates enough you just swap the truly junk battery for the garage collected marginal one, so once its rolling the garage loses nothing.
now someone is sure to post how they had a battery go 9 years and its still working and i am nuts, this happens every time i post my method.
honestly i dont care my method works just fine for me..................!