you can cancel at any time
Source:https://www.smartusa.com/resources/doc/smart_battery-assurance-plus_SEO.pdf page 7
"now for the question you really want answered: how much is the battery rental fee? being that you’re financially savvy, we think you’re really going to like the budget-friendly battery rental fee. you pay $80 + tax month-to-month and you can cancel at any time. however, once you cancel, you can’t renew at a later time. in addition, once you cancel, you will be required to return the battery to mercedes-benz financial services. when you do the math, you’ll discover that the overall cost of ownership or lease is significantly lower with battery assurance plussm."
Source:https://www.smartusa.com/resources/doc/smart_battery-assurance-plus_SEO.pdf page 7
"now for the question you really want answered: how much is the battery rental fee? being that you’re financially savvy, we think you’re really going to like the budget-friendly battery rental fee. you pay $80 + tax month-to-month and you can cancel at any time. however, once you cancel, you can’t renew at a later time. in addition, once you cancel, you will be required to return the battery to mercedes-benz financial services. when you do the math, you’ll discover that the overall cost of ownership or lease is significantly lower with battery assurance plussm."