It sounds to me like you were sold a defective battery. I would try to exchange the newly purchased battery if you can. The battery you purchased may have had a long shelf life at the sellers facility causing it to discharge its voltage over time. A good battery usually has around 40% charge when shipped to buyers, and should have no issues powering the phone. The fact that your old battery works but the new doesn't leads me to believe the new battery is defective and hopefully you can return it for another battery.