There is a replacement battery available for the Savi W740.. Here are the details: Catalog Number: 2081 Part Number: 84598-01 Product Code: PTR/SAVIW740/BATTERY This battery is NOT the same as the replacement battery for the CS540. While you CAN use a CS540 headset with a W740 Savi, the headset the W740 comes with is NOT the same as the CS540, it is actually a CS545XD headset, which has a hot swap battery*. The battery for this model slides all the way off, instead of plugging in under a battery door. SO, if the Customer has a headset that has a battery door and a plug-in battery, they need the CS540 battery. If they have a battery that slides all the way off the back of the headset, they need the Savi W740 battery. Thank you for your cooperation. *For all you awesome nerds that need to know what a hot swap battery is, here you go: A hot-swap battery refers to a battery product that can be safely removed and inserted onto a product without shutting it down. This is a useful feature fo…