HQRP 3300mAh APS Battery for iROBOT Roomba 531/533 / 536/537 / 551/561 / 563/564 / 571/577 / 578/600 / 611/790; 800/880 Series [Vacuum Cleaning Robot] Replacement plus Coaster HQRP&reg; Green Line APS Battery Pack plus HQRP&reg; Coaster; Battery Type: Ni-MH Rechargeable Battery Pack; Capacity: 3300mAh; Volt: 14.4V. High Drain! 15% more charging cycles compared to the standard battery! 10% more capacity and extra power compared to the standard battery! Up to 2.5 hours cleaning time! 100 days warranty! Please note that Vacuum Cleaner is not included in our offer.