Mainly Renault lease the batteries separate to the cars. Cost based on a mileage agreement. You can buy the car and batteries outright if you prefer. When I looked into it, the cost of a Zoe lease plus battery lease finished up being virtually the same as a normal lease on the i3.
Home chargers start around £150 installed, which is what I paid. You can get a grant which is why that low. I could have paid 4 times more for a BMW charger that did exactly the same, but had fancy LEDs and was probably designed by Philippe Starck.....
Gary, the Sport i3 was talked about before I ordered my car, but I didn't want to wait. It will be more money as well. The facelift will be very minor but will include better battery range. Don't think a significant amount though. Like said before, if you keep waiting for the next big thing, you'll wait forever....