I bought a lightly used (2,000 miles) 2017 Zero SR with the factory installed Charge Tank. I'm planning on removing it. It has never been used to my knowledge, I have not used it anyway. It requires installation by a dealer, about $200 depending on your shop's labor rate. SF Moto quoted me that much anyway. It requires new plastic bodywork as well, altho I may be talked out of my red set that is in excellent condition. New they are $2,295. $1,500 or best offer. It's still on the bike at this time.