What is the average time of use with full charged battery ?

I'm not sure how long the battery life is as I haven't exceeded it yet. I am frequently on 1 to 2 hr long calls, frequently back to back and it hasn't given up yet. Plus, recently I had a wave of back to back calls that took up most of the day, so I was on the phone even longer which easily exceeded 5 hrs. Hope this helps. I use my headset a lot and it hasn't failed.

Questions & Answers: Replacement 3.7V 140mAh 82742-01 84598-01 Battery for Plantronics Savi W440, Savi W440/M, Savi W740, Savi W740/M, Savi W745 & Savi WH500 Wireless Headsets

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Replacement 3.7V 140mAh 82742-01 84598-01 Battery for Plantronics Savi W440, Savi W440/M, Savi W740, Savi W740/M, Savi W745 & Savi WH500 Wireless Headsets

Replacement 3.7V 140mAh 84598-01 82742-01 Battery for Plantronics Savi W440, Savi W440/M, Savi W740, Savi W740/M, Savi W745 & Savi WH500 Wireless Headsets.

$10^.95 –