David Clark H10-13X?

[RAIM]

Hi,

I have a David Clark H10-13X ENC headset with 9V Battery Power and have been using a 9V rechargable battery. At the moment I am only getting about 6 hours life out of a full charge.

Can anybody tell me what sort of life that are getting from a normal alkaline battery? What about rechargable?

Thanks in advance.