Non existent after sales service and unavailability of spares (batteries) for cell phones

I purchased a HTC ONE m8 cell phone at the beginning of 2014 because I read quite a few reviews which were very positive and all indicated that this phone was some way ahead of the usual SAMSUNG / LG / etc comopetition, All is true and I enjoy my phone still today and do not want any other. It is in pristine condition and works brilliantly. PROBLEM: The battery is nearing the end of its life and the HYC call centre told me that HTC does not support this phone with batteries anymore.....BUT they could give me 20% on a new phone !!!!..BANG, BANG, brilliant , functioning phone onto the rubbish heap... Shocling, I will not touch a HTC again..... Gerd Kopanski