Accidently left my key in the on position for around 4hrs, have had the battery on a trickle charger for around 15hrs charger says it's still charging. Unhooked my charger and tried the ignition everything is still dead, could my battery be shot or might I have killed something else? thanks.

 

You need to try charging it overnight if your charger has an automatic cut off. Worst case, you need a new battery, but everything else should be just fine.