Below is my hand typed copy of the warranty in my Ford Focus Electric's handbook. This answers the question, posed by some, about the warranty of the battery and the guarantee of a minimum capacity being maintained over the 8 year warranty period.
"Note: Lithium-Ion Battery Gradual Capacity Loss
The Lithium-ion battery (EV battery) will experience gradual capacity loss with time and use (similar to all lithium-ion batteries), which is considered normal wear and tear. Loss of battery capacity due to or resulting from gradual capacity loss is NOT covered under the New Vehicle Limited Warranty. See your Owner's Manual for improtant tips on how to maximize the life and capacity of the Lithium-ion batttery."
The following was written by Tom Volek for King 5 News.
http://www.king5.com/on-tv/driving-nw/F ... 97255.html
It came from an interview with Mike Tinskey, the Associate Director of Vehicle Electrification at Ford and he spoke directly about the life of the battery.
Worried About Battery Durability?
Ford isn’t. The pack has a 10-year warranty. They’ve been making hybrids for years now and monitoring the units in taxi fleets, they’ve found them to be much like new after significant use. Their belief is that after 10-12 years of normal use, the battery should still have 80 percent of its original capacity. Ford says that the pack is integral to the car and, much like a gas engine, is not easily replaceable. The thinking is after a dozen years you’ll be tired of the car and will sell it to a college student who just needs a reliable runabout for city use, just like any other 12-year-old car.
I can only assume he messed up his notes because the Ford Battery Warranty reads as follows:
"(4) Your vehicle's unique hybrid / electric components are covered during the Hybrid / Electric Unique Component Coverage, which lasts for eight years or 100,000 miles, whichever occurs first."
2012 Ford Focus Electric. Delivered 5/29/2012