The Equinox metal detectors do not take batteries for operation. Instead, they have a built-in lithium ion battery that comes with the appropriate charging cable that plugs into any USB-A port. It provides approximately 12 hours of operation.
You also have the option of plugging the Equinox into a power bank for operation even if the lithium-ion battery is dead.
The internal battery can also be replaced if needed by Minelab or an authorized dealer.