Get the full scoop with photos at the Minelab Service Parts website. So far nobody appears to be selling the 3011-0405 battery but someday it will be something to possibly have to deal with. So far though I've not heard of any battery longevity issues... mine still give me a full day service and they are the oldest in the country. Replacement Minelab Equinox battery with battery door/plug (separate part)