Your warranty is way over priced. It does not cover deterioration of the battery. It is a Nissan factory warranty.
These rates are from Santa Rosa Nissan. They were posted on the forum a while back.
http://nissansantarosaservicecontracts. ... -coverage/
Ph. # 800-558-6403
1. LEAF Gold Preferred 36 Month 45,000 Mile Coverage: $287.00
2. LEAF Gold Preferred 39 Month 49,000 Mile Coverage: $303.00
3. LEAF Gold Preferred 42 Month 53,000 Mile Coverage: $333.00
4. LEAF Gold Preferred 48 Month 48,000 Mile Coverage: $336.00
5. LEAF Gold Preferred 36 Month 60,000 Mile Coverage: $368.00
6. LEAF Gold Preferred 48 Month 60,000 Mile Coverage: $548.00
7. LEAF Gold Preferred 60 Month 60,000 Mile Coverage: $571.00
8. LEAF Gold Preferred 60 Month 75,000 Mile Coverage: $591.00
9. LEAF Gold Preferred 72 Month 75,000 Mile Coverage: $711.00
10. LEAF Gold Preferred 60 Month 100,000 Mile Coverage: $755.00
11. LEAF Gold Preferred 84 Month 70,000 Mile Coverage: $824.00
12. LEAF Gold Preferred 72 Month 100,000 Mile Coverage: $831.00
13. LEAF Gold Preferred 84 Month 100,000 Mile Coverage: $1,084.00
14. LEAF Gold Preferred 96 Month 100,000 Mile Coverage: $1,134.00