Placed my order for a 2017 Zero SR with Charge Tank last Saturday at my local dealer. Asked a couple days ago if the Charge Tank was a dealer or factory install option. They said it can be done either way, dealer installed as add-on accessory, or installed at the factory during the build order. For those that don't know, the Charge Tank is a complete replacement for the stock tank cover, but without the lockable storage trunk. Here is the kicker, if you order a new Zero with the Charge Tank from the factory there is no discount given for the part (full retail price), and you don't get the original tank and locking storage trunk. That is a big deal for me as I want to keep this very nice new feature from the 2017 bikes.
After going a couple rounds with the dealer as to why this is so, and a confirmation e-mail from Zero Motorcycles confirming, I changed my order to the '17 Zero SR without the Charge Tank installed, and ordered the Charge Tank as a separate accessory. The dealer said the installation will be included by them when the part arrives, and is the same list price for the Charge Tank the factory charges for it. The plus is I get to keep the original tank and lockable storage trunk should I need/want to convert it back to original stock order. Upsetting to me that Zero would sell you an accessory as part of the build and keep the original part.