Quote 1:
"The battery pack is expected to retain 70% to 80% of its capacity after 10 years but its actual lifespan depends on how often fast charging (440-volt) is used and also on environmental factors. Nissan said the battery has a "lifespan of 5–10 years under normal use". The Leaf's battery is guaranteed by Nissan for eight years or 100,000 miles (160,000 km)"
Source:
http://en.wikipedia.org/wiki/Nissan_Leaf
Quote 2:
"Nissan UK senior vice-president Andy Palmer has said the Leaf hatch’s lithium-ion power source consists of 48 modules, each costing £404 to replace. So owners could face a bill of up to £19,392 for a new pack"
Source:
http://www.autoexpres...y_could_cost_19k.html
Chris