So my son left the key on overnight on my 450s and now my battery is completely dead, can't even get the neutral green light to come on to attempt it... if I hook to my car battery will I get the light to come on so I can jump it? I'll leave the car off to prevent surge issues but not sure what else to try, I did a trickle charge over night and still got nothing... of course we're having a blizzard today and can't use my damn plow!!!

 

Once the battery drops below a certain voltage they wont come back and need to be replaced. Time ro go shopping!

 

One night with a flat battery isn't going to kill it unless it was already on it's last legs. Leave it that way for a week, and it probably wouldn't recover. Start it up with the jump leads, do the job, keeping it running if possible and see if the alternator has put some life back in. The trickle charger should have done the trick overnight, but it is very easy not to get the clips contacting properly, with a totally dead battery, best way to check they are right is to switch the ignition on for a few seconds, if the neutral light does come on, the clips are on properly.

 

They already said exactly what I would have said.