Juniper Systems Allegro CX Manual - Manual (Page 37)

Allegro CX Owner’s Manual 37
How Alkaline Battery Gauging Works
Alkaline batteries have a more predictable linear slope to the voltage
discharge curve than NiMH batteries. Therefore, 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 Duracell Ultra and
Energizer Titanium alkaline batteries.
Temperature and loading affect alkaline battery voltage, causing the
gauging to behave differently in changing environmental conditions.
When moving from a cold environment to a warm one, the battery
status icon may increase slightly. In cold temperatures the alkaline
batteries have less capacity than in warm temperatures, thus the
voltage output is higher.
Recharging the NiMH Battery Pack
It is recommended to charge the Allegro battery pack when it is
not in use. You can do this by leaving the battery in the Allegro and
plugging the unit into the AC wall charger, or by placing the unit in
the USB/Power Dock powered by the AC wall charger. The Allegro
features a built-in intelligent charging circuit that manages the
charging of the batteries and prevents them from being overcharged.
Temperature Ranges for Charging the NiMH Battery Pack
The Allegro’s NiMH batteries are charged most effi ciently at
temperatures ranging between 10° to 20° C (50° to 68° F) when the
AC power adapter is used.
The Allegro batteries must be charged
when the battery temperature is between 0° to 40° C (32° to 104° F)
due to the nature of NiMH batteries.
The chart below describes the Allegro battery charging behavior at
different temperatures.
Temp. Range
Degrees C Temp. Range
Degrees F
Charging Behavior
Recommended
Charge Range 10° to 20° 50° to 68° Most effi cient; batteries charge
within three hours.
Acceptable
Charge Range 0° to 30° 32° to 86° Batteries are charged within four
hours.
Too Cold
Range < 0° < 32° The batteries must reach 0 C (14 F)
before they begin to charge.
Too Hot
Range
> 30° >86° Battery charge cycle is complete in
four to fi ve hours. If the batteries
become too warm, they may only
reach 90 to 95% charge capacity.
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