Logitech CS-LOY11RC Battery - Replacement for Logitech L-LY11 Mouse Battery (600mAh, 3.7V, Lithium-Ion) Replacement Logitech CS-LOY11RC Battery Replacement for Logitech L-LY11 Mouse Batteries Lifetime Warranty Capacity: 600mAh, Upstart Battery Brand On Sale for a Limited Time!