Mechanicals - Fisher Labs F 75 User Manual

F75
Comprehensive Operating Manual & Guide to Metal Detecting

Mechanicals

BATTERIES
The F75 requires four AA batteries.
These non-rechargeable chemistries may be used: Alkaline, Nickel Oxy-Hydroxide
(Panasonic Oxyride or Duracel PowerPix), and lithium iron disulfide (Energizer L91).
Nickel metal hydride and nickel-cadmium rechargeable chemistries may also be used.
Zinc-carbon and so-called "heavy duty" batteries may not work, especially in cold weather.
Do not use these batteries.
Expect 40 hours of service in the field with one set of alkaline batteries.
Rechargeable batteries will usually deliver over 25 hours of service without recharging, but
when they start running low, they die suddenly with little warning.
Always install batteries which are of the same type and the same state of charge. Otherwise
battery life will be determined by the weakest battery, because the good batteries cannot
deliver their power with a dead battery blocking the current.
All 4 batteries are installed with the positive terminals facing upward.
The LCD screen shows battery condition on the right.
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