Juniper Allegro CE Owner's Manual page 33

Setting Battery Charge
After installing the battery pack into the Allegro, the battery charge
percent must be set. This allows the Allegro to know the pack's
charge status. When you insert the battery pack into the Allegro for
the first time, the charge status is unknown to the Allegro.
To set the charge status of the battery pack after you install the battery
pack for the first time, complete the following:
1) Turn on the Allegro by pushing the On/Off button.
As Windows CE loads, various screens appear that do not require
any action until it gets to the New Battery Detected screen.
2) Tap on the circle next to the Specify charge (%) option to set charge
status.
3) Set the charge percent to 10 by taping on the small up or down
arrows to move the percent.
The capacity of the NiMH battery we have provided with the
Allegro is 3800 mAh, so this will not change.
4) Tap on OK to save the set charge percent.
The New Battery Detected screen closes and the charge status is set.
Once the battery pack is fully charged, the gauging is automatically
set to 100%. The battery task bar icon indicator now accurately
reflects the battery charge.
Hardware Features Page 2-21