I know for me, the battery life is super dependent on keeping the filter clean, makes a huge difference. It is washable with water and should be done once a month.

Also, running on non-max mode works pretty well, and is super important to use the bare floor attachment for bare floors and the other one for carpet. I could see if the whole house was carpet the battery would have less runtime. And of course, keeping that filter clean is so, so important!