How time flies!! the batteries in wifeys and my z-2 are 5 years old,exides bought at menards same time,6 degrees this morning-2am,hers cranked fine,mine lazy but not bad-but only sat 9 hours.I usually change them every 5 and keep them and give a junker core [I find them every where].I see menards now carries the cheap a/c delco,The auto parts stores are CRAZY with their prices.Won't buy a walmart one [had problems with last 2 had to unleash my elderly dad on them at the time plus the walmart thing LOL] I seem to remember they are only a couple of manufacturers.I'm not that saaavy to do the discount/rebate blah blah blah at advance,guy at work did it on his phone at the place and ended up actually getting a fair price on one. Group75 battery Funny,the last take out [now 10 years old] is in the z and spins it over like mad,got the other one in the tractor and it works too!!!! Sorry about the epic-Advise? Later Steve!!