If the talk time on your CS500 headset is too short:
1. Check your wideband/narrowband switch on the back of your base. It takes more power to operate in wideband mode, so talk time will decrease by 3-4 hours in this mode. Try switching to narrowband mode to see if talk time increases.
2. If you are operating in narrowband mode and you still experience short talk time, the battery in the headset may be wearing out. If your headset is under warranty, Plantronics can replace your battery. Contact the Plantronics Technical Assistance Center for replacement information. If your headset is out of warranty, you can purchase a replacement battery from www.calloneonline.com