Customer must visit a participating John Deere dealer, or online at Shop.Deere.com and purchase select StrongBox Original Equipment or Standard-Duty battery during the offer period. Qualifying customers will have received an email regarding the health of their machine's battery with an offer of 20% discount on select Strongbox batteries. Customer can use the coupon code online at Shop.Deere.com or in store. For in-store purchases, customer must present email during purchase. Discount to be applied before additional taxes, shipping etc.