when Bike is stored and On the trickle charge does it also charge the siren II battery it doesnt seem so I replaced it 1.5 years ago with a 1.75 battery they didnt have the 2.0 so it isnt as loud now unless you ride for a couple of hours then it is normal any way I just couldnt see giving the stealer 17 bucks for a 9 volt battery !!!