Some time ago I bought a used Philips FC6161 from one of the electrode pads. I have never trusted this type of vacuum cleaner, but it honestly surprised me. I temporarily skip the fact that I have changed it quite hard; among others I replaced the lithium batteries (while increasing the voltage by about 15%). Nevertheless, it surprised me positively with the suction power and I think that this is due to the use of a hepa filter in the form of a cone (as in the case of car air filters). All in all, nothing new - the larger the filtering surface, the lower the flow resistance and the longer the cleaning time. Unfortunately, no filter of this size will work in vacuuming very small impurities (it clogs up quickly). Also cleaning up spilled ash or dust after drilling a hole in the wall for a dowel equals immediate filter cleaning. Here, generally disliked by me Philips surprised with a sensible filter shaking system. Just turns the mechanism, which bends and rapidly releases the filter fins causing dirt to fall off them.
It's hard to say about working time on one charge. Original batteries were used and the vacuum cleaner worked effectively for up to 10 minutes. On lithium 21.6V 2.5Ah it works effectively about 20 minutes. I suppose the new ones will only have lithium batteries. A big plus when cleaning the carpet (for me it is only a walkway 2.5mx1m) n is an electric brush.
In summary, I can speak in superlatives, realizing the limitations of wireless vacuum cleaners. First of all, I do not recommend buying online. It is worth going to the store and see the equipment in real life. If such information is available, I will say that the minimum engine power that guarantees some reasonable cleaning effect is 150-250W. And note that although current technology makes it possible, vacuum cleaners of this power are rare.
If the manufacturer / seller does not provide this type of information, the power can be calculated to some extent. The battery voltage in V multiplied by its capacity in Ah will give the capacity in Wh. So if it is stated that the vacuum cleaner works after charging for half an hour, its power is twice the capacity expressed in Wh.
