CS-PLM500SL Battery 80mAh compatible with [Plantronics] Discovery 640E, Discovery 650E, Explorer 50, M50, Voyager 5200 replaces 1704018-0944, 71468-01

I was getting about an hour with my old one and this one lasts about 3.5Hrs. So although the Plantronics Voyager information estimates 6hrs, its nowehere near that.Its cheap and looks it, but hey its just a battery.The design of the Plantronics doesn't make it easy to open up to replace the battery. I needed a small soldering iron and magnification to accurately solder the new battery in. The rubber sleeve on the Plantronics was falling apart and stretched (its about 4 years old) and its connectivity to the phone is still dodgy (as it was before replacing battery), but thats nothing to do with the battery.