T4900CT
1.8 Batteries
The T4900CT has three types of batteries:
❑ Main battery pack
❑ Backup battery
❑ Real Time Clock (RTC) battery
These batteries’ specifications are described in table 1-6.
Table 1-6 Batteries’ specifications
Battery name Material Output voltage Capacity
Main battery Nickel Metal Hydride 12 V 2,600 mAh
Backup battery Nickel Metal Hydride 7.2 V 35 mAh
RTC battery Lithium-Vanadium 3.0 V 50 mAh
1.8.1 Main Battery
The removable main battery pack is the computer’s main power source when the AC adapter
is not attached. The backup and main battery maintain the state of the computer when you
enable AutoResume.
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