Is it worth buying a new battery for this Polti vacuum cleaner ?

I have had a Polti Forzaspira slim cordless vacuum with a 21.9 volt Li-ion battery. It has worked well, but recently the battery life has reduced to about 1 minute and then you have to plug it in again. We had this problem before when it was under warranty, and a replacement was provided for free, which gave us about anther 18 months' service, before the battery problem came back again.  I am considering buying a battery for it, which would cost some £85. Would this be advisable? Thanks for any advice.  


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