I work out of my home and have multiple teleconferences each day. I have a 2-line Panasonic phone system with 5 cordless handsets. I replace the batteries every 2 years or so, when the batteries start to have less than 1 hour talk time. I replaced my Panasonic batteries with these "no-name" batteries this time, because I had difficulty locating the name brand ones. After 1 month of use, I find these batteries have less talk time than the old batteries I just discarded.... about 45-60 minutes. Not only that, unless its my imagination, it is taking much longer to recharge them. So I find myslelf going around the house switching phones during my teleconferences.