Years later and that solution worked for me too. Thanks fullwit!

Thanks, reversing batteries worked.

Reversing the batteries did not work for me. I did all this plus pushed the reset button and still says low battery.

Verify your battery voltage.
I wouldn't try reversing, although it appears to work for many. I think just pressing the buttons with the batteries removed would discharge the internal capacitor. Some electronics have a protect diode to protect from reverse polarity, and can damage? My Opinion?

Reversing batteries helped! Thank u so much!

Switching the batteries the wrong way worked for us too! Thank you!