Lifetime of the battery's too short

and when I say life - I do not mean life or work.
This was my 2nd Battery Broom Vileda. And again I had only weeks maximum pleasure on the device.
Although charging is monitored and conducted ordnungsegmäß - stopped responding after a certain point the battery. Whether he was deeply discharged / is I can not say, as the unit ran out while working, no longer be allowed to load and was no longer make a sound.
An exchange or return took place without any problems through Amazon.
So, at first we do not have a battery broom longer in use. It would be great if there was a really powerful device on the market.