Strictly speaking, Robot vacuums is designed for the big space, It can greatly save the time of manual cleaning, however it doesn’t mean it’s not suitble for small space. robot vacuum is smarter & powerful than before, only there is extra space left between your furniture, it still can do a very good job
Like small apartment, big battery is not very necessary, cause long running time is not required, regular robot vacuum cleaner that can work as much as 100㎡ without charging. so all that means small battery or regular battery is enough, the price of robot vacuum will be cheaper accordingly.
All robot vacuums has dust bin, normally from 200ml to 600ml, you have to clean the dustin when house cleaning finished every time. however small space also means less dust, so the smaller and regular dust bin capacity is working, and you can have more options on market.