Genuine Savi W440, Savi W440-M, Savi W740, Savi W740-M, Plantronics CS540-XD OEM Replacement Battery or Spare Battery.
- Easy to install, just slide the old one off and snap new one on
- Provides up to 7 hours talk time on a full charge
- Full charge takes 3 hours (charge approximately 20 minutes prior to the first use)
- Approximately 1 1/4" x 7/8" x 1/4" thick
note: you can replace the battery mid-call, without losing the call, as long as a charged battery is reattached within 5 minutes. This allows for unlimited talk time.