The Saramonic WiTalk9 uses a readily available NB-6LH style battery that can power the master headset for 10 hours, and each remote headset will operate for 13 hours on a single charge.
Compatible for Saramonic WiTalk9
Replaceable Battery Capacity 1450mAh
Power Requirements Powered by a replaceable battery / USB-C charging port
Runtime (Master) ≥ 10 h (with 4 remote headsets connection); ≥ 9 h (with 8 remote headsets connection)
Runtime (Remote) ≥ 15 h
Charging Time ≤ 3.5 h (charging via USB-C port in shutdown mode)