Adjective
(electronics, of a device) Using a battery to maintain operation when not powered by the main electrical supply (e.g. during a blackout).
(electronics, computing) Using a battery to maintain volatile memory when powered off.
(video games, of saved game data) Written to a volatile memory chip in a video game cartridge to maintain the data when not in use.
Source: en.wiktionary.orgA fairly normal mapping could easily address up to 95 Mbit of ROM data (48 Mbit at FastROM speed) with 8 Mbit of battery-backed RAM. Source: Internet
Encrypted variants of the 68000, being the Hitachi FD1089 and FD1094 store decryption keys for opcodes and opcode data in battery-backed memory, was used in certain Sega arcade systems including System 16 to prevent piracy and illegal bootleg games. Source: Internet
Later computers, including all IBM-compatibles with 80286 CPUs, had a battery-backed nonvolatile BIOS memory (CMOS RAM chip) that held BIOS settings. Source: Internet
Cartridges may also contain battery-backed SRAM to save the game state, extra working RAM, custom coprocessors, or any other hardware that will not exceed the maximum current rating of the console. Source: Internet
In the interim period, IBM-compatible PCs including the IBM AT held configuration settings in battery-backed RAM and used a bootable configuration program on disk, not in the ROM, to set the configuration options contained in this memory. Source: Internet
Instead of battery-backed RAM, the modern Wintel machine may store the BIOS configuration settings in flash ROM, perhaps the same flash ROM that holds the BIOS itself. Source: Internet