Well, I think I killed my battery!
I'm pretty pissed at myself
Weather isn't too bad today and wanted to take a short ride and I didn't have my tender on the scoot for the last couple weeks as I took it off for my son to put it on his bike.
Seems as the ignition switch was some how left on and the battery is now dead!
When hooking the tender to the battery now the tender is just flashing red indicating that it is not charging....
Grrrr...... This battery is just a year old!
Is there any hope?
Aging is mandatory, growing up is optional.
My kids call me 'crazy', I prefer 'Eccentric'.
Nullius in verba
There is a pretty good chance that the deep discharge will have a noticeable impact on the ability of the scooter battery to hold a charge. If you depend on the scooter to commute to work or other time sensitive needs, you might be better off to replace it. Small starting batteries are not meant to be deeply discharged, but you may be able to save it by connecting it to another good 12V source for a short amount of time and then putting it back on the Tender.
Most small automatic (smart) battery chargers won't charge a totally dead battery. If you have a set of jumper cables, you can try hooking the dead scooter battery to a car battery (don't start the car) for 20-30 minutes to get a quick base charge back into the scooter battery. The small capacity of the scooter battery will not drain the car battery very much, so it should still be able to start the car with no need for external charging.
After 20-30 minutes, remove the jumper cables and hook the scooter battery up to the tender again. If the battery has accepted the base charge, it might recharge the rest of the way on the tender.
If you want others to be happy, practice compassion. If you want to be happy, practice compassion.
I have done it before, the current is not a problem. People have been jump starting completely dead lead acid batteries since they were first used in vehicles.
Since the real issue is the fact that automatic "smart" chargers will not revive a completely dead battery (they usually need to see 2-3V to self test), another option would be to use an old school manual battery charger that will not care what the level of charge in the dead battery is. I still have a couple of these in my workshop, but I assume that most people don't have one kicking around these days.
As I mentioned, there will most likely be a decreased storage capacity in the battery that was allowed to completely discharge. I would personally just plan to replace the battery, since they are really not all that expensive.
If you want others to be happy, practice compassion. If you want to be happy, practice compassion.
A battery tender cannot/will not charge a totally dead battery......read the instructions.
Get ahold of a conventional 1 amp charger and use it for one hour.
Then, remove it and hook up the tender......it will now charge the battery to its full capacity.
left on 
and the battery is now dead!
