The UV light:
In my opinion, it's a little gimmick. Need you do not do it really, but it is sometimes quite interesting to see where in the apartment are spots and where not. I can imagine the UV light function well at pet owners.
Conclusion:
I use only the primary charging function. Since I usually have access to a power outlet in the evening, me this relatively small battery, but the good helps me through the day is sufficient. Small and practical!
