Review on Upgrade Your Robot Vacuum With SPARKOLE 14.4V 2600MAh Replacement Battery For Ecovacs Deebot N79S, Eufy Robovac 11 And More! by Charlie Maadhadians

This battery replaced the OEM perfectly! I get about 90 minutes of runtime and it seems to be holding up well, even though I've only had it about a month. I have no reason to believe it will fail early as so far I have not seen a lessening of run time. I know from 25 years of working on electronics that often poor battery reviews are actually due to a problem with the charging circuit of the device, and not the battery. This one works just fine for me.Edit 3/9/22, My battery failed after 15 months of daily use. It is actually still working OK, but it is giving me the dreaded "four beeps and red light" when charging. I'm not deducting any stars because the description says it will provide "500 charge cycles", which it almost lived up to. When used and charged daily, 15 months of daily use equals approximately 455 charge cycles - so there's nothing for me to complain about.