BT 4500 synergy poor performance

Poor quality phones, first set I bought I thought I was unlucky the base phone would not charge. Changed batteries followed all instructions but the connectors were no good. Got the same set again, and again after a couple of years phones no longer hold charge regardless of new batteries and quality of batteries. After only half an hour the phones beep and then cut you off. Absolutely dreadful - my advice avoid these phones - see the other reviews for other models- wish I had read those before wasting my money. Am now going to research reliable cordless phones.