Put it on a slow trickle charge over night (about 2 amp or less) after checking water level to be sure you didn't boil a bunch off while jumping it from the car.

Not a good idea, no.

ok, so i should be good by keepin it on the tender all night? the battery was brand new 20 miles ago

yea i dont have a charger. that is what the tender is supposed to do

ok thanks alot for the help. im sure ill be posting more questions soon lol

A completely dead battery sometimes will not accept a charge, at least at first. A "smart" battery charger will sometimes see a very dead battery as defective, and refuse to even try charging it. I have not used a brand-name Battery Tender, so I don't know its logic. Try connecting it, and if it doesn't show the battery as defective, it will eventually do the job.

these bikes have alternators, not generators... a generator will charge a discharged battery, an alternator will not... you need the battery to provide a minimum of 12 volts, while the bike is running, for the charging circuit to work... so, trickle or tender charge until a volt meter reads at least 13 volts on the batt terminals... that's with the charger turned off(or disconnected).... at that point, you could jump it, and have it charge... much better to fully charge the battery, then go riding.... most of the chain auto parts stores will charge a battery for you, way cheap, as well as most mechanics shops (cages or bikes)... sears, walmart, kmart, and all auto parts stores sell small 10 amp max chargers.... cheap, and most handy... tenders "float charge" and most wont charge a completely discharged battery....