Juniper Allegro 2 Owner's Manual page 29

The Power control panel appears, displaying the remaining
battery power.
Battery packs last approximately 1,000 to 3,000 charging
cycles before they need to be replaced. This is impacted by
applications and environmental factors.
Depending on the current charge on the battery, you may
see different displays when turning on the unit. If the battery
is completely discharged, you will see the following image.
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Chapter 2 Hardware Components