I dunno about the gen 1 but I have a ballistic evo2 12 cell battery....NEVER any worries! No need for a battery tender, only loses 10% charge a year!
+100 Best battery I ever bought! And, made in the USA - unlike the Shorai which is made in the Orient... in case that is important to you.
What about Justin? He always has a lot of deals on parts and helmets. I would say get a hold of him or Pashnit
Who is this Justin, i have tried to do a search so i can contact him but came up with nothing.
I just happen to be a Shorai battery dealer now