Had an AGM battery in my '75 650 for a year and a half. Went to start the bike this week and it was dead. Of course it was out of warranty. It cost me about $140 when I bought it. It was on a battery monitor. Ordered a new yasua AGM on line for $39.00 shipped. Has anybody had any experience with these batteries. When I checked it after a 4 hr charge it only had 7 volts in it setting on the bench. When put back in bike and hooked up it would show no voltage. When unhooked it would show charge. Batteries nowadays are weird. There are no shorts in wiring on this bike.