We keep coming up with these threads about batteries. I'm not going to say anything about the lithium batteries cuz I have no experience with them. But I will say, why fight or argue about what we know works. I have a bike in my shop right now that had an off-brand battery in it. I don't know if the battery sorted out the voltage regulator, or the voltage regulator shorted out the battery. But it cost him dearly, new EHC, and of course a new Deka battery, speedometer speed sensor, tack ring, front brake light switch, and we'll find out soon enough what other component that that'll go bad in the near future, that were weakened, by pumping ac voltage to the system. This is the third time I've run into this.
If you are still running your original charging system, I highly recommend you change it out before it cost you thousands of dollars like this guy.