Juniper Systems Allegro DOS Manual - Manual (Page 42)

Page 2-24 Hardware Features
The operating times previously stated are based on a typical application
where the Allegro performance level is set to medium, the Power
Manager is on, data are being entered manually on the keyboard, no
external devices are powered by the Allegro, the backlight is used 10%
of the time, and processing time is 20%. The actual operating time could
vary from as little as five hours to as much as 30 hours, depending on
your program and how the system is set up.
Recharging the NiMH Battery Pack
For applications where the Allegro is used for several hours each day,
the NiMH batteries can be charged daily. The Allegro’s built-in
intelligent charging circuit manages the charging of the batteries and
prevents them from being overcharged.
You should always be aware of the status of the main batteries before
you go out into the field to collect data. The batteries may need to be
recharged before you go. You need to take into account the amount of
battery life that is left and how much time is required for charging the
pack.
Temperature Ranges for Charging the NiMH Battery Pack
The Allegro’s NiMH batteries are charged most efficiently 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° degrees F) due to the nature of NiMH
batteries.
The chart below describes the Allegro battery charging behavior at
different temperatures.
Temp. Range Temp. Range
Degrees C
Degrees F Charging Behavior
Recommended 10° to 20° 50° to 68° Most efficient; batteries charge
Charge Range within three hours.
Acceptable 0° to 30° 32° to 86° Batteries are charged within four
Charge Range hours.
Too Cold < 0° < 32° The batteries must reach 0° C (14°
Range F) before they begin to charge.
Too Hot > 30° > 86° Battery charge cycle is complete in
Range four to five hours. If the batteries
become too warm, they may only
reach a 90 to 95% charge capacity.