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Bottom view
Figure 5. ThinkPad Edge E420 and E520 bottom view
1 Battery
2 SIM card slot
3 PCI Express Mini Card slot for wireless WAN
4 Memory-upgrade slot
5 Hard disk drive
6 PCI Express Mini Card slot for wireless LAN/WiMAX
1 Battery
Use your computer with battery power whenever ac power is unavailable.
By installing an extended life battery available as an option you can extend the operating time of the
computer.
You can also use Power Manager to adjust your power setting as needed. For details, refer to the instructions
in “Power Manager” on page 23.
2 SIM card slot
If your computer has a wireless WAN feature, it may require a SIM (Subscriber Identication Module) card to
establish a wireless WAN (Wide Area Network) connections. Depending on the country of delivery, the SIM
card may be already installed in the SIM card slot.
3 PCI Express Mini Card slot for wireless WAN
Your computer might include a PCI Express Mini Card for wireless WAN in the PCI Express Mini Card
slot which enables wireless WAN communications.
4 Memory-upgrade slot
You can increase the amount of memory in your computer by installing a memory module in the memory
bay. Memory modules are available as options.
Chapter 1. Product Overview 9