SRAM
From PHWiki
SRAM is a form of RAM (random access memory).
A simple persistent data storage circuit can be constructed out of an SRAM chip and a battery to provide the refresh current. When the battery runs out data is lost. This sort of circuit is used in many PCs to hold BIOS settings, and it has also been used for savegames on carts going back to the NES.
Most GBA Flash Cards use SRAM for saves, and so do many official GBA Game Paks. But some newer GBA Game Paks have a pseudo-SRAM implemented using ferroelectric RAM, which does not need a battery.
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