AGM batteries are the '' go-to '' battery these days !. for one : they don't spill acid, second : they seem to last longer than acid batteries ?..THATS IF YOU KEEP A BATTERY TENDER ON THEM ?!. I just replaced my battery in my '89 trx350D foreman the other day, I had a AGM battery ( ever start ) from wally world, paid about 70 bucks when I bought it, it lasted a good 10 years, soooo..i got my money's worth to say the least. I replaced it with a oem battery from my local dealership, it too is like a glass mat battery, will never spill. oh, AGM = ALL GLASS MAT in case your wondering ? .