Extended battery life for Plantronics Savi and CS over-the-head models now shipping: New battery provides up to 13 hours of talk time (up from 9) for most models. The new battery is backward compatible to units in the field, and the spare battery is available now for purchase (part # 202599-03). Savi/CS models with the date code of L4 or later are guaranteed to have the new battery. Description: … Continued