Juniper Systems Allegro DOS Manual - Manual (Page 46)

Page 2-28 Hardware Features
How Battery Gauging Works When Using Alkaline Batteries
Alkaline batteries have a better slope to the voltage discharge curve than
NiMH batteries. Because of this, the voltage can be read directly to
gauge the battery charge percent.
The gauging may vary depending on the grade and brand of the
batteries being used. For best results, we recommend that you use the
new types of alkaline batteries such as the Duracell Ultra
™ and
Energizer Titanium ™ .
Temperature and loading affect alkaline battery voltage and may cause
the gauging to behave differently in different environmental conditions.
When moving from a cold environment to a warm one the battery
charge LED indicators may actually move up instead of down.
This happens because in cold temperatures the alkaline batteries
actually have less charge capacity than in warm temperatures and this is
reflected in the voltage output.
Battery Status LED Indicators
There are five LEDs. Depending on which LED is lit, starting left and
moving right, the battery charge remaining is as follows:
LED Status Indicator Battery Charge Remaining
1 Blinking Low Voltage 0 to 10%
1 Steady Light Charge Flow 10% to 20%
2 “ “ 20 to 40%
3 “ “ 40 to 60%
4 “ “ 60% to 80%
5 “ “ 80% to 100%
❖ Important Note: The LED indicators are meant to give only an approximate
indication of battery charge remaining, not an exact reading.
When the battery charge drops to 10%, the voltage begins to drop off
rapidly. When the Allegro detects this low battery condition, the battery
status LED indicator farthest to the left begins to blink to let you know it
is time to recharge or replace the batteries.
You have from ten minutes to one hour (depending upon power
consumption rate) to save your data and exit your program.