The industry answer to that is leased batteries.
I believe the batteries on the OP's Renault are leased at £45 a month.
It's another monthly expense, but the owner of the car shouldn't have to worry about batteries wearing out.
Someone else posted on here to say a charge at home costs about £3, which could take you up to 200 miles making it cheaper than buying four gallons of fuel.
It appears many of the public charging points are free, so I reckon if you worked at it a little bit you could probably get the majority of your charges for nothing.
The lease is £49/month for 4500 miles/annum. Doubt it will get used quite as much as that. There are other higher leases for more miles too.
Renault have gone for a battery lease model, Nissan a battery buy one. Though the dealer could do either option on both cars. Really depends on how you want to do the finances. Buying the battery on the Zoe adds around £5k to the price - doubling the purchase price. The car is an ex-lease, seem to be a lot being returned and Renault slowly dripping them back as used buys into the market as the first batch of leases finish. On a Zoe forum a guy is complaining Renault have offered him £2500 trade in, webuyanycar £2495 on an 18 month old one

. So makes sense to me as a used buy with the lease - no battery worries on a 3 year old 27k miles car. The dealer said he is getting them from Renault and pretty much shipping them straight to the London for people buying them straight off his web site.
I know of charging points in one of the local multi storeys - it's supposed to be free but the parking is £2 for 2 hours, so it should balance out. Maybe give it a try tomorrow and hope some gormless twunk hasn't parked in the bays.
To be clear, we haven't bought it because of its green credentials. We've bought it because it's a good fit with my wifes use and will be cheaper to run the the outgoing Skoda. And importantly she really likes it.
It is a little strange at first to drive, and we've had several autos. Keyless entry, foot on brake, press 'start'....and pretty much nothing happens. Select 'D' and press accelerator. It is ridiculously quiet, the audible clues you get for the engine to change gear, or an autobox changing just don't happen - seems really odd at first. Gives a relaxed feel to driving, something I think Renault have tried quite hard to achieve with the cabin too. Clarkson/May/Hammond recently commented on how nice Volvo interiors were as they use a lot of light colours - the Zoe similarly is all light greys and white. Much more airy feel than the Leaf.
Only real pain is we will need a proper charging point installing for faster charging, but even they are subsidised up to £500. However once it's done the car can be programmed to heat up/demist while its plugged in. This seems better than an ice-scraper in a morning to me
