it seems like once the battery goes dead and sits for a while, they are toasted. If they don't hold a charge a cell or cells have gone bad. After replacing the batteries, get them all on some form of an auto shut off trickle charger. This also works well for autos that sit for weeks at a time.
03 Green Rincon/Black wheels, 25" Bighorn Radials, 2" tip, HL front springs, 155 Keihin main jet, 50 pilot, Dynojet spring and needle, 2nd notch, K&N, Outerwear, Aluminum Products front/back a-arm protection & belly plate, 2.5XT Warn winch, Amsteel synthetic winch line, Oury grips, Moose grip heaters, black Maier hand guards, gun rack, Jameserizer custom hitch, Kolpin RealTree camo bag, RealTree camo seat cover, Outerwear shock covers, vent line mod, water pump drain hose mod, fan switch, 0W/40 Amsoil 4-stroke Oil, NKG IFR6L11 cool plug.