I just bought a Citroen C-Zero (a rebranded imiev) here in Italy. It was used as a demonstrative vehicle in 2012/2013 (exp. date of its last insurance was October 2013) and then it was left alone for 2 years. When I tried it at the dealer it looked absolutely new, even the tyres. It was manufactured on April 2012 so I knew it should have been fitted with a 16 kWh battery pack (unlike new C-Zeros that are sold with a 14.5 kWh pack) It was perfect on the road, I got 1 year full guarantee from the dealer, and the battery pack was guaranteed by Citroen for 5 years starting from registration date (October 2012), so at 12k euros I had no hesitations and I bought it.
As soon as it arrived at home (22nd december, a nice Christmas present!) I plugged in and fully charged it. I jumped in to have my first ride in my new car... but the gauge was showing just 12 bars instead of 16, and the RR displayed just 82 kms left (50 miles). At first I thought it could have been because the battery was standing unused for 2 years and needed some cycling, so I drove till 2 bars were left (the charge only lasted for 45 kms / 28 miles) and charged fully again. Same story: 12 bars and 82 kms left on the RR gauge.
This time I tried do discharge the battery completely, I wanted to see the turtle light on my dashboard. Instead, as soon as I had 1 bar left the EV warning symbol showed up. I slowly drove back home and called Citroen.
Now my car lies at the dealership, they told me they probably have to change the battery pack (they also told me the car needs to go through 3 different recall repairs...)
On one hand it is nice to know I will have a brand new pack (made with the new lev50n cells), on the other hand I will receive a 14.5 kWh pack, so a lower range for my car.
I am sharing my experience because I find interesting that even a battery pack with such a low mileage can fail. I have no information on how the car was stored during these years, but considering the mint condition of the body and tyres I suppose it was kept inside.
Unfortunately I haven't received my OBD interface yet, so I have no CaniOn data to share.