2x Pack - Logitech 831409 Battery - Replacement for Logitech L-LL11 Mouse Battery (600mAh, 3.7V, Lithium-Ion) Replacement Logitech Battery for 190310-1000, 190310-1001, 190310-2001, 831409, 831410, G7, L-LL11, MX Air Mouse, MX Revolution New Generation, NTA2319 Battery Capacity: 600mAh, Voltage: 3.7, Type: Lithium-Ion Quantity: 2, Lifetime Warranty On Sale for a Limited Time! Grade A Quality. High Capacity.