how long does the battery when recording ? null
with the hero8 black, this time can range from 45 to about 80 minutes depending on what settings you choose. details are available at https://gopro.com/help/articles/block/gopro-camera-battery-life#hero8\_black.
you will need to manually link each battery record to all of its battery test records (using a linked record field).

then you can create a rollup field to give you the average of all its battery tests. Oops wrong record! answer: `1.00` Hello,  
  
Put in new batteries and try again.  
  
If new batteries did not solve the problem, the next thing to check would be the battery terminal.  
  
If
 the battery terminal is rusty, the battery power won't contact and the 
calculator won't turn on. So, use a flat small screw drive to scratch 
the battery terminal so that there would be contact.  
  
If the above
 is not the problem, the next to check would be the wire connecting the 
battery terminal to the the calculator's main board. There is a wire 
between the battery terminal and the calculator board. When the battery 
is inserted, the power from the battery goes from the terminal to the 
board through this wire. There is a possibility that this wire is cut 
in-between or is loosing contact. In this case, you need to get a small 
screw driver and carefully disassemble the calculator in order to check 
the wire.  
  
If the wire is intact, use a light brush to brush the calculator board as there might be dust on the board.  
  
If non of the above helps, then it means the calculator is dead and needs a replacement.  
  
Regards. If the laptop battery is more than 3 - 4 years old then the battery could be worn out. Rechargeable batteries have a finite number of charge and discharge cycles and will lose their charge capacity over time, i.e. won't charge to 100% and gradually the charge reduces until the battery won't charge up at all.  

OR The battery shows a 100% charge but when the adapter is disconnected the battery drops off to zero capacity in a very short time.  
If the battery drops to an unacceptable charge level then the battery needs to be replaced zero send it to electronics recycling. why annoy yourself with bad performance. If you hold down the button for a couple minutes, will your computer boot? If so, there's probably just something wrong with the switch. It takes Okinawa Praise for single full charge is 6-8 Hrs hours Have you tried enabling the Stero Mix function in the Sound options within Control Panel? I'm assuming you are using Windows 7 here, so go into Sound and the the tab that says Recording. Right click and choose "Show Disabled Devices". Then right click on the option that says Stero Mix and choose Enable.  

From there download Audacity for free from the internet (or alternatively use whatever program you currently use) and start recording from any source playing from your computer.