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Query: battery backup
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This guide by F4ANN (2014) explains replacing the backup battery in a YAESU FT-757 GX when stored frequencies reset on power-up. The original CR-1/3N lithium cell (3V, 160 mA) can be substituted with a CR2032 (170 mA), which is cheaper, widely available, and easier to replace. The process involves opening the transceiver, carefully desoldering the old battery from the PCB, and wiring in a holder for the CR2032. Extra care is required with screws, connectors, and soldering. The author also replaced backlights and serviced the cooling fan. Future battery replacements are simplified to four screws.