For the following:
Dell 724-BBKG 85K yield at 5% coverage
Dell Cloud Multifunction H815dw/Smart Multifunction S2815dn/S2810dn
Your drum unit will shut down at every cycle of 85K printed pages, leaving you unable to print, even though there may be plenty of life left in the drum unit.
Slash printing costs by simply replacing the chip which shuts the unit down, please note that this chip will not revive a worn drum unit, which is not producing good quality prints.
Each chip lasts for one cycle of 85K printed pages, after which it must be replaced.