Installation & Operation 1-5
August 2008
Charging the Batteries
(cont.)
IMPORTANT: To ensure the maximum charge, charge the batteries in
an ambient temperature of 50 to 104°F (10 to 40°C).
To charge the batteries, simply plug the AC power module cord into
the power jack (shown in Figure 1-1 on page 1-2) and be sure the
battery pack is installed. When the PT878 is plugged into line voltage,
the internal battery charger automatically charges the batteries,
whether the PT878 is ON or OFF. If the PT878 is ON, the Battery
icon in the upper right corner of the screen indicates battery status (as
shown in Table 1-2 below).
Note: For version 1B of the PT878 software, you must also press
the red power key in the upper right corner of the keypad.
Storing the Batteries Always observe the following battery storage temperature ranges:
• 2 days or less: -40 to 158°F (-40 to 70°C)
• less than 1 month: -4 to 131°F (-20 to 55°C)
• more than 1 month: 32 to 104°F (0 to 40°C)
Table 1-2: Battery Status Icons
Icon Battery Status
Full battery
Partially full battery
Empty battery
Fully charged battery, connected to AC power
Charging battery
Discharging battery
Failure/missing battery
Notification to check battery
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