{"product_id":"mitsubishi-c52005-replacement-battery-36v-1200mah-li-socl2","title":"Mitsubishi C52005 PLC Replacement Battery 3.6V 1200mAh Li-SOCl2","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eMitsubishi C52005 — 3.6V Li-SOCl2 Replacement Battery (FBT030A)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis 3.6V, 1200mAh lithium-thionyl chloride cell replaces the FBT030A backup battery in the Mitsubishi C52005 PLC. It powers the real-time clock and SRAM memory retention circuit when mains power is removed. Without a functioning cell, the controller loses its program and clock data on the next power cycle.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eC52005 memory backup circuit:\u003c\/strong\u003e\n    The C52005 uses a dedicated Li-SOCl2 cell — not a rechargeable — because the SRAM retention draw is in the microamp range. A lithium-thionyl cell holds a stable 3.6V across that load for years. Alkaline or NiMH cells cannot match that flat discharge curve at this current level.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We measured open-circuit voltage on arrival, then placed the cell under a 50µA load representative of PLC SRAM retention. Voltage held steady above 3.5V throughout the load test. The cell met rated capacity within normal tolerance for Li-SOCl2 chemistry.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eHot-swap procedure for this controller:\u003c\/strong\u003e\n    Always replace this battery with the C52005 powered on and in RUN mode. Removing the cell while the PLC is powered off clears SRAM instantly. If the controller was off during the swap, a full program reload from the programming device is required before the unit will run.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the C52005 loses its program after a battery swap\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe C52005 holds its ladder logic and parameter data in static RAM, not flash. SRAM requires continuous voltage from the backup cell to retain data — the moment that voltage is interrupted, memory clears. Even a two-second gap during a battery swap is enough. The battery must be swapped live, with the controller powered and in RUN mode, to maintain the SRAM voltage rail without interruption.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eBattery alarm not clearing after a confirmed good installation\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe C52005 does not clear a battery low alarm automatically once a new cell is installed. The fault flag is latched in the controller's diagnostic register and must be reset manually through the programming software. Connect to the PLC via GX Developer or GX Works, navigate to the diagnostics or special relay section, and reset the battery alarm bit. If the alarm returns immediately after reset, verify the cell is seated correctly and the connector is fully engaged.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43415973429338,"sku":"BWCS-MMC520SL-1","price":23.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43415973462106,"sku":"BWCS-MMC520SL-2","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43415973494874,"sku":"BWCS-MMC520SL-3","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-MMC520SL-1.webp?v=1779758775","url":"https:\/\/batteryweb.com\/products\/mitsubishi-c52005-replacement-battery-36v-1200mah-li-socl2","provider":"BatteryWeb","version":"1.0","type":"link"}