SOLVED: New battery not working

I replaced the batteries in my slim folio. And yes, I put them in the holder correctly. The folio did not work and the folio’s battery light did not light. I removed the new batteries and checked their voltage. Each were above 3 volts. I installed them again, still not working. I then tried a different pair of batteries that tested above 3 volts, still not working. PURCHASED TWO NEW BATTERIES AND THEY WORKED.