The Voyager 510 headset will last for up to 6 hours after a full charge.
The Explorer 320, 340, 350 , Voyager 520, 815 and 855 headsets will all last for up to 8 hours of talk time between charges.
Bluetooth: Talk Time
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The Discovery 640 , 610 and 640E headsets will last for approximately 5 hours between charges, and up to 15 hours when used with the AAA charger. The Discovery 645, 655, 655E & 665 headsets will last for approximately 3-3.5 hours with a full charge, which can be extended to 9-10 hours when used with the AAA charger.
The Pulsar 590A , 590E and 260 headsets will work for up to 12 hours of talk time and up to 10 hours of listening time.
All of the Bluetooth headsets listed above use a rechargeable lithium-ion battery that can last for up to 500 charging cycles. These batteries are built into the units and cannot be replaced.