My Ecovacs 900 Seris original battery was depleting from full to zero in about 20 minutes. I put this replacement battery in and fully charged it before using. After about an hour of cleaning, the new battery still had about 35-40% charge left. Time will tell on longevity but so far I am pleased with the purchase. Direct replacement. Watch how the original wires are run since the space for the battery is limited.
