average number of minutes for hf 9.5 coil

[Waterdog]

I go out metal detecting with the Hf 9.5coil set at 15 khz and after 2 hours of use it says I have used half the power of the coil. Will I loose any performance of the machine ?
I know the coils are fairly new, but has anyone averaged the number of minutes you can get on a HF 9.5 coil say on 15 khz while out hunting ? Or on any other freq. ?

 

[BobOso]

I have an elliptical coil and can go all day long and still have battery left., perhaps you have a bad battery

 

[Waterdog]

Thank you for the quick reply. How much battery do you have left and how many hours do you hunt ?
I ordered one yesterday. Hopefully it will be here before next weekends hunt with the group.

 

[Lodge Scent]

I can easily get 2 hunts at 5 hours each with no problems.

 

[jmaclen]

If you have the elliptical white coil, 15 kHz uses the most battery power. 31 kHz would add 5 more hours or so to battery life. Page 32 in the version 5 manual (I think) has a battery times versus frequency settings charts. My 9” HF coil gets between 16 and 20 hours running at 31 kHz. That chart says the 9.5 by 5 will get up to 14 hours at 14 kHz.