Battery life on Zoom H4N

We are at a loss for what is going on here. Our Zoom H4N will take brand new batteries and in less than 30 minutes of use, the unit shows that the batteries are dead, then the unit itself shuts off.

The thing is, we used a voltage tester for the batteries that the H4N said were dead...they were fully charged.

Why is the H4N acting like the batteries are dead when they're fully charged? Can anyone troubleshoot this?
 
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