Siemens Simatic Field PG Manual page 26

Getting Familiarized with the SIMATIC Field PG
Bottom view
The supplied rechargeable battery is installed behind a cover. The rechargeable
battery (Lithium-Ion) makes the device portable, independent of an external power
supply. The battery pack also prevents data loss in case of power failure. See also
section 3.3.
You can install memory submodules in these slots to increase main memory.
Maximum memory expansion: 2 x 256 Mbytes. Remove the cover to access the
memory submodules. See also section 4.1.
The rating plate and "Certificate of Authenticity" with the Microsoft Windows
"Product Key". You need this to install new software.
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SIMATIC Field PG Manual
A5E00075760-04