Used this for the first time today and haven't decided yet whether I'll keep it or return it. First of all, the guide should be much better. The charts don't help much. Also, something is supposed to be removed from the battery compartment before turning the vacuum on, which I didn't have. It charged and worked fine, so I guess it didn't matter? The manual also says NOTHING about doing anything with the filter before use, but when I opened the vacuum to clean it after use, there was a piece of…