I have a buddy that works for a batterie company that has been getting me batteries for years and he just got a big shipment of dump truck group 31 batteries and they are what I've sold all my friends and family and they love them... I told him I would try to help him sell these they are group 31 1250 amps 1000cca 150 reserve on them... I went from the 31 blue top optimas options to these and have not noticed a bit of difference in them they stay charged just as long as the optimas and haven't noticed any lost power... they are $80.00 with the old cores which is a steal for a battery of this caliper... he is a business so they are not stolen or anything like that they also come with a 36 month warranty on them... I figured I'd try to help some people out while helping him sell them if interested PM me I am located in shepherdsville but work in Louisville his business is out of Lebanon junction.... Thanks Chris