Hello, I've noticed in newly coming peugeot iOn (same to iMIEV) that battery capacity decreased from 16kWh to 14.5kWh according to car manual which can be seen there:
http://public.servicebox.peugeot.com/ddb/
I was surprised by reading about iOn produced after 15/05/2012 - capacity is 14.5kWh...