Trimble Juno T41 - Chapter 1 Getting Started; 1.3 Battery Charging Procedure

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1.3 Charging the battery
IMPORTANT: Before using the Juno T41 for the first time, charge the
device for at least 4 hours. The notification LED will turn green when fully
charged.
CAUTION: Avoid Extreme Heat
 The battery is designed to stop operating at or above 149
°F (65 °C). If this status icon appears, the battery has
overheated to 140 °F (60 °C) or more.
 If the battery temperature exceeds 158 °F (70 °C), the
battery will be disabled and the device must be sent to an
Authorized Service Provider to have the battery replaced.
Operating Temperature Range: -22 °F to 140 °F (-30 °C to 60 °C)
Storage Temperature Range: -40 °F to 158 °F (-40 °C to 70 °C)
CAUTION: Do not exceed specified storage temperature.
1. Connect the USB end of the T41 Custom USB Client cable to the
AC charger.