ALZA TX-850 - Batteries; Battery life; Battery indicator

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Batteries
The detector requires a single 9-volt ALKALINE battery.
Do not use ordinary zinc carbon batteries.
Do not use “Heavy Duty” batteries.
Rechargeable batteries can also be used.
If you wish to use rechargeable batteries, we recommend using a Nickel Metal Hydride
rechargeable battery.
The battery compartment is located on the back side of the housing.
Slide the battery door to the side and remove it to expose the battery compartment.
Battery life
Expect about 15 to 20 hours of life from a 9-volt alkaline battery. Rechargeable batteries
can provide up to 8 hours of usage per charge.
Speaker volume and battery charge
You may notice the speaker volume drop when only one battery segment is illuminated.
With one segment flashing, low speaker volume will be very apparent.
Battery indicator
The 3-segment battery indicator has 4 stages of indication.
These indications re accurate for a 9-volt alkaline battery.
Segments Illuminated
Battery Voltage
3-segments
More than 8.4 volts
2-segments
More than 7.5 volts
1-segment
More than 6.8 volts
1-segment flashing
Less than 6.8 volts
After the 1
st
segment begins flashing, expect the detector to shut off within 10 minutes.
A rechargeable battery will usually illuminate two to three segments throughout most of
its useful charge. But as soon as it drains to the 1-segment level, it will then lose its
charge very rapidly.