Garrett Metal Detectors Metal Detectors GTAx 550 - Manual (Page 40)

BATTERIES
The GTAx 550 is equipped with two battery packs,
each holding four standard AA batteries. The detector
is also designed to use rechargeable batteries (Ni-
MH). It is recommended that top quality heavy duty
or alkaline batteries be used. All adjustments or
settings you have entered into the detector will be
replaced by the factory settings when batteries are
removed for approximately four minutes or more.
Although standard battery packs can be used
interchangeably in the detector, it is recommended
that both packs being used at the same time always
contain the same type of battery. For example, don't
mix carbon zinc and alkaline batteries.
40