Antigravity ATX20 RE-START Battery
I've just installed an Antigravity ATX20 in my 2014 NRS. This was listed on the AntiGravity site as recommended, but on sites like Revzilla it still lists the older, smaller and general purpose battery.
The ATX20 is almost a direct fit replacement for the stock battery, just about 1/2" shorter but width and length are similar. It was as snug fit. The terminals are duplicated front to back, a neat trick, but slightly recessed too. Weight - 3.5 lbs.
It arrived fully charged, installed pretty easy. It came with spacers to increase the height, but I left them off since there is a tangle of wires under my airbox and a little more space is a good thing. I can reach the "Restart" button by removing the airbox cover. As far as I can tell, the key fob or remote for activating "Restart" is not available yet.
I am not a experienced rider, having just hit the 2000+ mile and 1 year anniversary of owning a NRS, but it feels like the bike is more nimble and a little quicker. Taking all that weight off the front forks can't be bad.
If you need a stock battery, my old one is available.