Hi, I decided to test the Equinox battery and stated run time. The test was simple. Full charge, then let sit in a corner with the threshold turned up to make a continuous but not overly loud tone. The machine was down to a flashing battery indicator at 12 hours and sometime before it hit 12.5 hours the unit went dead. That jives with Minelabs stated battery life of up to 12 hours. However, running the coil over the ground makes the circuit work harder, as can numerous options, like us