http://www.lithiumion-batteries.com/

12V 100AH Lithium Ion Battery $1299.99
The Smart Battery 12V 100AH Lithium Ion Battery features an automatic built in battery protection system (BPS) that keeps the battery running at peak performance and protects the cells for thousands of cycles. The SB100 is plug and play for any application that currently uses a lead acid, gel or agm battery