If the tender shows it's charging the battery, you just need a little more patience. If it was that dead it's going to take a very time with the tender. I'm surprised it came on if the battery was that dead but since it did, it will eventually charge it enough to start. When it does, take it for a ride for at least twenty minutes and that should charge it enough to be good. I bet the battery will recover and be fine for a long time.

For peace of mind, take the battery out and take it to an auto parts store or even better, a Batteries Plus if there is onw near you and ask them to test it. They will tell you they can't test a dead battery and ask you to leave it. They will charge it for you and then test it. If it passes, you got a free battery charge, if not, then Batteries Plus sells a Duracell that has a two year warranty. You won't find a battery warranty better than that,.

Unless it's changed, a new battery warranty is only good for a year so you may or may not be under warranty. Replacement from the dealer are only 6 mos.

Good luck.

 

Thanks, appreciate that perspective.

We've owned alot of sport bikes (and other Harleys) and I think I'm just used to most batteries being fine after being on the tender overnight. I'll leave it on the tender for now, but I also ordered an actual charger as a backup plan in case a few more days go by and it's still not showing any improvement. If that fails, I will probably just remove the battery and take it to Batteries Plus. If it works, I'll probably ride it around for ~20 minutes, bring it home and make sure it starts up fairly regularly at home before relying on it.

As I mentioned previously, I do need to take it for a recall service anyway, so at that point I may look into getting it all checked out to make sure things are good. My only hesitation there is them saying "oh yeah of course, you need a new one." Lol.

 

When we have a bike come in with a dead battery in a scenario we put it on our Midtronix tester, which charges and tests the battery. Typically it will cycle for up to two hours between 10 and 15 amps in order to bring the battery back. The only way warranty will cover a battery is with the Midtronix GRX printout with the warranty number, and the test indicated a bad battery. If the bike is to be parked for more than two weeks plug it into a battery maintainer or remove the main fuse.

 

Good idea posting everything about the maintainer, but leaves me with a question. Does that maintainer AUTOMATICALLY change from 6 to 12 volts? If it does, and your battery was dead, the maintainer may have assumed it was a 6 volt battery and that is all the farther it charged. If it is 12 volts only, there is a good chance the battery is shot. All of the suggestions above are good for that case.

 

 

So I checked it Tuesday night and last night, both times with just headlights on it went to about 11. I have a NOCO 3500 charger scheduled for delivery today, I will get that hooked up tonight and then check it tomorrow to see if it made a difference.

I'd have to double check the paper but I do believe that's what it was. I will call first, I think that's what it said to do actually. Thanks!

 

If it's still that low and the tender says it's charging, you probably will need it replaced. Did you try to start it again? Can't hurt at this point. Only way to know for sure is to charge it with a real charger and then put a load tester on it.

 

So i am having a similiar issue with my 2017 SG, however living in Hawaii I ride almost daily, went out this morning and just a zapping noise ride is about 20 miles from home to wqork so charge should be accomplished in this time. The cold weather is basically non existant. I put my tender on it, still zapping sound i have it back on the tender to top it off, then i am going to check the voltage under load to make sure its not going below 9.5v. Should this HD battery have already **** the bed? I am hoping its not anything major.... but if i do need a new battery AGM or Lith Ion?