Set of 2 Tenergy Li-ion 7.4V 4400mAh Replacement Battery for Neato XV-series XV-11, XV-12, XV-14, XV-15, XV-21, XV-25, XV Essential & XV Signature, Neato Robotics 945-0005 205-0001 945-0006 945-0024 Direct Replacement - Designed as a direct replacement for Neato XV-series (XV-11, XV-12, XV-14, XV-15, XV-21, XV-25, XV Pro, XV Essential & XV Signature, Neato Robotics 945-0005 205-0001 945-0006 945-0024) Smart and Safe - With built-in protection, this battery helps prevent against damage caused by overcharging, overheating, and short circuiting. More Charge Cycles - Up to 800 charge cycles compared to 200 cycles for the original NiMH Battery. (Charge cycle is from discharge to full recharge) Longer Runtime - Tenergy Li-ion 7.4V 4400mAh replacement battery has 30%-40% longer run time than the Neato original 3000mAh battery Longer Idle Time - The ultra low self-discharge rate (1% per month) eliminates the need to keep the battery charging all the time. This will save energy and prolong the lifetime of the battery